chore: PostgreSQL migration compatibility and infrastructure improvements

Database & Migrations:
- Update all Alembic migrations for PostgreSQL compatibility
- Remove SQLite-specific syntax (AUTOINCREMENT, etc.)
- Add database utility helpers for PostgreSQL operations
- Fix services to use PostgreSQL-compatible queries

Documentation:
- Add comprehensive Docker deployment guide
- Add production deployment documentation
- Add infrastructure architecture documentation
- Update database setup guide for PostgreSQL-only
- Expand troubleshooting guide

Architecture & Validation:
- Add migration.yaml rules for SQL compatibility checking
- Enhance validate_architecture.py with migration validation
- Update architecture rules to validate Alembic migrations

Development:
- Fix duplicate install-all target in Makefile
- Add Celery/Redis validation to install.py script
- Add docker-compose.test.yml for CI testing
- Add squash_migrations.py utility script
- Update tests for PostgreSQL compatibility
- Improve test fixtures in conftest.py

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

mkdocs.yml

@@ -184,9 +184,10 @@ nav:
     # --- Deployment & Operations ---
     - Deployment:
       - Overview: deployment/index.md
+      - Infrastructure Guide: deployment/infrastructure.md
       - Launch Readiness: deployment/launch-readiness.md
+      - Traditional VPS: deployment/production.md
       - Docker: deployment/docker.md
-      - Production: deployment/production.md
       - GitLab CI/CD: deployment/gitlab.md
       - Environment Variables: deployment/environment.md
       - Stripe Integration: deployment/stripe-integration.md