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>

.architecture-rules/_main.yaml

@@ -47,6 +47,7 @@ includes:
   - language.yaml
   - quality.yaml
   - money.yaml
+  - migration.yaml
 
 # ============================================================================
 # VALIDATION SEVERITY LEVELS
@@ -75,7 +76,7 @@ ignore:
     - "**/test_*.py"
     - "**/__pycache__/**"
     - "**/migrations/**"
-    - "**/alembic/versions/**"
+    # Note: alembic/versions is NOT ignored - we validate migrations for SQLite compatibility
     - "**/node_modules/**"
     - "**/.venv/**"
     - "**/venv/**"