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>

docker-compose.test.yml

@@ -0,0 +1,19 @@
+# docker-compose.test.yml
+# Test database for pytest - uses tmpfs for speed
+services:
+  test_db:
+    image: postgres:15
+    restart: "no"
+    environment:
+      POSTGRES_DB: wizamart_test
+      POSTGRES_USER: test_user
+      POSTGRES_PASSWORD: test_password
+    ports:
+      - "5433:5432"  # Different port to avoid conflict with dev db
+    tmpfs:
+      - /var/lib/postgresql/data  # Use RAM for faster tests
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U test_user -d wizamart_test"]
+      interval: 5s
+      timeout: 5s
+      retries: 5