refactor: standardize markdown file naming to kebab-case convention

Renamed all documentation files to follow kebab-case naming standard:
- UPPERCASE files → lowercase (e.g., RBAC.md → rbac.md)
- snake_case files → kebab-case (e.g., icons_guide.md → icons-guide.md)
- SCREAMING_SNAKE_CASE → kebab-case (e.g., DATABASE_SETUP_GUIDE.md → database-setup-guide.md)

Files renamed (15 total):
API Documentation:
  - api/RBAC.md → api/rbac.md

Architecture:
  - architecture/API_CONSOLIDATION_PROPOSAL.md → api-consolidation-proposal.md
  - architecture/API_MIGRATION_STATUS.md → api-migration-status.md

Development:
  - development/AUTH_DEPENDENCIES_GUIDE.md → auth-dependencies-guide.md
  - development/CUSTOMER_AUTHENTICATION_IMPLEMENTATION.md → customer-authentication-implementation.md
  - development/CUSTOMER_AUTH_SUMMARY.md → customer-auth-summary.md
  - development/icons_guide.md → icons-guide.md

Database Seeder:
  - database-seeder/DATABASE_INIT_GUIDE.md → database-init-guide.md
  - database-seeder/DATABASE_QUICK_REFERENCE_GUIDE.md → database-quick-reference-guide.md
  - database-seeder/DATABASE_SEEDER_DOCUMENTATION.md → database-seeder-documentation.md
  - database-seeder/MAKEFILE_DATABASE_SEEDER.md → makefile-database-seeder.md

Error Rendering:
  - error-rendering/ERROR_RENDERING_DEVELOPER_DOCUMENTATION.md → error-rendering-developer-documentation.md
  - error-rendering/HTML_ERROR_RENDERING_FLOW_DIAGRAM.md → html-error-rendering-flow-diagram.md

Getting Started:
  - getting-started/DATABASE_QUICK_REFERENCE.md → database-quick-reference.md
  - getting-started/DATABASE_SETUP_GUIDE.md → database-setup-guide.md

Updates:
- Updated all references in mkdocs.yml
- Updated all cross-references in markdown files
- Verified mkdocs builds without warnings or errors

Standard: Use kebab-case (lowercase-with-hyphens) for all markdown files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/api/authentication.md

@@ -1253,7 +1253,7 @@ For a condensed cheat sheet of authentication patterns, see [Authentication Quic
 
 ## Related Documentation
 
-- [RBAC System](RBAC.md) - Role-based access control and permissions
+- [RBAC System](rbac.md) - Role-based access control and permissions
 - [Architecture Overview](../architecture/auth-rbac.md) - System-wide authentication architecture
 - [Backend Development](../backend/overview.md) - Backend development guide
 - [API Reference](../backend/middleware-reference.md) - Auto-generated API documentation

docs/api/error-handling.md

@@ -287,6 +287,6 @@ async def invalid_token_handler(request, exc):
 ## Related Documentation
 
 - [Authentication](authentication.md) - Authentication-related exceptions
-- [RBAC](RBAC.md) - Authorization and permission exceptions
+- [RBAC](rbac.md) - Authorization and permission exceptions
 - [Rate Limiting](rate-limiting.md) - Rate limit error handling
 - [Testing Guide](../testing/testing-guide.md) - Testing error scenarios

docs/api/shop-api-reference.md

@@ -832,7 +832,7 @@ POST /api/v1/shop/auth/login
 - ✅ Cleaner URLs (~40% shorter)
 - ✅ Same functionality, better architecture
 
-**See:** [API Migration Status](../architecture/API_MIGRATION_STATUS.md)
+**See:** [API Migration Status](../architecture/api-migration-status.md)
 
 ---
 
@@ -908,4 +908,4 @@ For live API testing and exploration:
 
 ---
 
-**Questions?** See the [API Migration Status](../architecture/API_MIGRATION_STATUS.md) or [Shop Architecture Guide](../frontend/shop/architecture.md).
+**Questions?** See the [API Migration Status](../architecture/api-migration-status.md) or [Shop Architecture Guide](../frontend/shop/architecture.md).

docs/architecture/api-consolidation-proposal.md

@@ -436,7 +436,7 @@ Should we:
 
 ## References
 
-- [Authentication Dependencies Guide](../development/AUTH_DEPENDENCIES_GUIDE.md)
+- [Authentication Dependencies Guide](../development/auth-dependencies-guide.md)
 - [Multi-Tenant Architecture](./multi-tenant.md)
 - [Middleware Stack Documentation](./middleware.md)
 - [URL Routing Overview](./url-routing/overview.md)

docs/architecture/api-migration-status.md

@@ -160,8 +160,8 @@ app/exceptions/error_renderer.py     → Added base_url calculation for shop con
 app/routes/vendor_pages.py           → Added CMS route handler
 app/templates/shop/errors/*.html     → Fixed links to use base_url
 docs/architecture/
-├── API_CONSOLIDATION_PROPOSAL.md    → Analysis & recommendation
-└── API_MIGRATION_STATUS.md          → This file
+├── api-consolidation-proposal.md    → Analysis & recommendation
+└── api-migration-status.md          → This file
 ```
 
 ---
@@ -427,8 +427,8 @@ Migration is considered successful when:
 ## Contact & Support
 
 **Questions?** Check:
-- [API Consolidation Proposal](./API_CONSOLIDATION_PROPOSAL.md) - Full analysis
-- [Authentication Dependencies Guide](../development/AUTH_DEPENDENCIES_GUIDE.md) - Auth patterns
+- [API Consolidation Proposal](./api-consolidation-proposal.md) - Full analysis
+- [Authentication Dependencies Guide](../development/auth-dependencies-guide.md) - Auth patterns
 - [Middleware Documentation](./middleware.md) - How middleware works
 
 **Issues?** Review:

docs/backend/middleware-reference.md

@@ -309,6 +309,6 @@ For testing examples, see the [Testing Guide](../testing/testing-guide.md).
 ## Related Documentation
 
 - [Authentication Guide](../api/authentication.md) - User authentication and JWT tokens
-- [RBAC Documentation](../api/RBAC.md) - Role-based access control
+- [RBAC Documentation](../api/rbac.md) - Role-based access control
 - [Error Handling](../api/error-handling.md) - Exception handling patterns
 - [Rate Limiting](../api/rate-limiting.md) - API rate limiting strategies

docs/backend/rbac-quick-reference.md

@@ -510,4 +510,4 @@ ENVIRONMENT=development|staging|production
 
 **Print and keep at your desk!**
 
-For full documentation: See [RBAC Developer Guide](../api/RBAC.md)
+For full documentation: See [RBAC Developer Guide](../api/rbac.md)

docs/development/customer-auth-summary.md

@@ -1,7 +1,7 @@
 # Customer Authentication - Quick Summary
 
 **Date**: 2025-11-24
-**Full Documentation**: [CUSTOMER_AUTHENTICATION_IMPLEMENTATION.md](CUSTOMER_AUTHENTICATION_IMPLEMENTATION.md)
+**Full Documentation**: [customer-authentication-implementation.md](customer-authentication-implementation.md)
 
 ## What Was Implemented
 

docs/development/database-migrations.md

@@ -324,5 +324,5 @@ Migration failures will halt deployment to prevent data corruption.
 ## Further Reading
 
 - [Alembic Official Documentation](https://alembic.sqlalchemy.org/)
-- [Database Setup Guide](../getting-started/DATABASE_SETUP_GUIDE.md)
+- [Database Setup Guide](../getting-started/database-setup-guide.md)
 - [Deployment Guide](../deployment/production.md)

docs/development/database-seeder/database-quick-reference-guide.md

@@ -242,6 +242,6 @@ make help-db     # Database-specific help
 ```
 
 **Documentation**:
-- `DATABASE_INIT_GUIDE.md` - Detailed guide
+- `database-init-guide.md` - Detailed guide
 - `MIGRATION_GUIDE.md` - Migration from old system
 - `README.md` - Project overview

docs/frontend/overview.md

@@ -349,7 +349,7 @@ For detailed information about the design patterns used across all frontends, se
 - **[Pagination System](shared/pagination.md)** - Pagination implementation
 - **[Sidebar Navigation](shared/sidebar.md)** - Sidebar setup guide
 - **[Logging System](shared/logging.md)** - Frontend logging configuration
-- **[Icons Guide](../development/icons_guide.md)** - Icon system usage
+- **[Icons Guide](../development/icons-guide.md)** - Icon system usage
 
 ---
 
@@ -497,7 +497,7 @@ For detailed information about the design patterns used across all frontends, se
 2. Study the page template guide for that frontend
 3. Review existing code examples (`dashboard.js` is the best)
 4. Check the [Shared Components](shared/ui-components.md) documentation
-5. Review the [Icons Guide](../development/icons_guide.md)
+5. Review the [Icons Guide](../development/icons-guide.md)
 6. Copy templates and start building!
 
 Questions? Check the detailed architecture docs or review existing implementations in the codebase.

docs/getting-started/cms-quick-start.md

@@ -184,7 +184,7 @@ Existing pages are never overwritten.
 For complete CMS documentation, see:
 - [CMS Feature Documentation](../features/content-management-system.md)
 - [CMS Implementation Guide](../features/cms-implementation-guide.md)
-- [Database Seeder Guide](../development/database-seeder/DATABASE_SEEDER_DOCUMENTATION.md)
+- [Database Seeder Guide](../development/database-seeder/database-seeder-documentation.md)
 
 ## Troubleshooting
 

docs/testing/vendor-api-testing.md

@@ -667,4 +667,4 @@ def test_endpoint(self):
 - [Testing Guide](testing-guide.md) - Testing strategy and best practices
 - [Test Maintenance](test-maintenance.md) - Maintaining test quality
 - [API Authentication](../api/authentication.md) - Authentication documentation
-- [RBAC](../api/RBAC.md) - Role-based access control
+- [RBAC](../api/rbac.md) - Role-based access control

mkdocs.yml

@@ -18,8 +18,8 @@ nav:
     - Quick Start: getting-started/quickstart.md
     - Database Setup:
       - Overview: getting-started/database-setup.md
-      - Complete Setup Guide: getting-started/DATABASE_SETUP_GUIDE.md
-      - Quick Reference: getting-started/DATABASE_QUICK_REFERENCE.md
+      - Complete Setup Guide: getting-started/database-setup-guide.md
+      - Quick Reference: getting-started/database-quick-reference.md
     - CMS Quick Start: getting-started/cms-quick-start.md
     - Platform Homepage Quick Start: getting-started/platform-homepage-quick-start.md
     - Configuration: getting-started/configuration.md
@@ -35,8 +35,8 @@ nav:
     - Request Flow: architecture/request-flow.md
     - Authentication & RBAC: architecture/auth-rbac.md
     - API Consolidation:
-      - Proposal: architecture/API_CONSOLIDATION_PROPOSAL.md
-      - Migration Status: architecture/API_MIGRATION_STATUS.md
+      - Proposal: architecture/api-consolidation-proposal.md
+      - Migration Status: architecture/api-migration-status.md
     - Diagrams:
       - Multi-Tenant Diagrams: architecture/diagrams/multitenant-diagrams.md
       - Vendor Domain Diagrams: architecture/diagrams/vendor-domain-diagrams.md
@@ -57,7 +57,7 @@ nav:
       - Quick Reference: api/authentication-quick-reference.md
       - Flow Diagrams: api/authentication-flow-diagrams.md
     - RBAC:
-      - Developer Guide: api/RBAC.md
+      - Developer Guide: api/rbac.md
       - Visual Guide: api/rbac-visual-guide.md
     - Error Handling: api/error-handling.md
     - Rate Limiting: api/rate-limiting.md
@@ -101,23 +101,23 @@ nav:
   # DEVELOPMENT (Shared Development Resources)
   # ============================================
   - Development:
-    - Icons Guide: development/icons_guide.md
+    - Icons Guide: development/icons-guide.md
     - Naming Conventions: development/naming-conventions.md
-    - Auth Dependencies Guide: development/AUTH_DEPENDENCIES_GUIDE.md
+    - Auth Dependencies Guide: development/auth-dependencies-guide.md
     - Customer Authentication:
-      - Implementation Guide: development/CUSTOMER_AUTHENTICATION_IMPLEMENTATION.md
-      - Quick Summary: development/CUSTOMER_AUTH_SUMMARY.md
+      - Implementation Guide: development/customer-authentication-implementation.md
+      - Quick Summary: development/customer-auth-summary.md
     - Database Migrations: development/database-migrations.md
     - Database Seeder:
-      - Documentation: development/database-seeder/DATABASE_SEEDER_DOCUMENTATION.md
-      - Makefile Guide: development/database-seeder/MAKEFILE_DATABASE_SEEDER.md
-      - Init Guide: development/database-seeder/DATABASE_INIT_GUIDE.md
-      - Quick Reference: development/database-seeder/DATABASE_QUICK_REFERENCE_GUIDE.md
+      - Documentation: development/database-seeder/database-seeder-documentation.md
+      - Makefile Guide: development/database-seeder/makefile-database-seeder.md
+      - Init Guide: development/database-seeder/database-init-guide.md
+      - Quick Reference: development/database-seeder/database-quick-reference-guide.md
     - Exception Handling: development/exception-handling.md
     - Frontend Exception Handling: development/frontend-exception-handling.md
     - Error Rendering:
-      - Developer Documentation: development/error-rendering/ERROR_RENDERING_DEVELOPER_DOCUMENTATION.md
-      - Flow Diagram: development/error-rendering/HTML_ERROR_RENDERING_FLOW_DIAGRAM.md
+      - Developer Documentation: development/error-rendering/error-rendering-developer-documentation.md
+      - Flow Diagram: development/error-rendering/html-error-rendering-flow-diagram.md
     - Environment Detection: development/environment-detection.md
     - Contributing: development/contributing.md
     - PyCharm Setup: