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>

tests/unit/models/database/test_customer.py

@@ -133,7 +133,8 @@ class TestCustomerAddressModel:
             address_line_1="123 Main St",
             city="Luxembourg",
             postal_code="L-1234",
-            country="Luxembourg",
+            country_name="Luxembourg",
+            country_iso="LU",
             is_default=True,
         )
 
@@ -158,7 +159,8 @@ class TestCustomerAddressModel:
             address_line_1="123 Shipping St",
             city="Luxembourg",
             postal_code="L-1234",
-            country="Luxembourg",
+            country_name="Luxembourg",
+            country_iso="LU",
         )
         db.add(shipping_address)
 
@@ -171,7 +173,8 @@ class TestCustomerAddressModel:
             address_line_1="456 Billing Ave",
             city="Luxembourg",
             postal_code="L-5678",
-            country="Luxembourg",
+            country_name="Luxembourg",
+            country_iso="LU",
         )
         db.add(billing_address)
         db.commit()
@@ -192,7 +195,8 @@ class TestCustomerAddressModel:
             address_line_2="Suite 100",
             city="Luxembourg",
             postal_code="L-1234",
-            country="Luxembourg",
+            country_name="Luxembourg",
+            country_iso="LU",
         )
         db.add(address)
         db.commit()
@@ -212,7 +216,8 @@ class TestCustomerAddressModel:
             address_line_1="123 Main St",
             city="Luxembourg",
             postal_code="L-1234",
-            country="Luxembourg",
+            country_name="Luxembourg",
+            country_iso="LU",
         )
         db.add(address)
         db.commit()
@@ -231,7 +236,8 @@ class TestCustomerAddressModel:
             address_line_1="123 Main St",
             city="Luxembourg",
             postal_code="L-1234",
-            country="Luxembourg",
+            country_name="Luxembourg",
+            country_iso="LU",
         )
         db.add(address)
         db.commit()