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>

docs/getting-started/installation.md

@@ -7,9 +7,13 @@ This guide will help you set up the Wizamart Platform for development or product
 Before you begin, ensure you have the following installed:
 
 - **Python 3.10 or higher**
-- **PostgreSQL 12 or higher**
+- **Docker and Docker Compose** (required for database)
 - **Git**
-- **Docker** (optional, for containerized deployment)
+- **PostgreSQL client tools** (optional, for debugging)
+
+!!! note "PostgreSQL Only"
+    This project uses PostgreSQL exclusively. SQLite is not supported.
+    Docker provides the easiest way to run PostgreSQL locally.
 
 ## Development Setup