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>

alembic/versions/7a7ce92593d5_add_architecture_quality_tracking_tables.py

@@ -28,7 +28,7 @@ def upgrade() -> None:
         sa.Column(
             "timestamp",
             sa.DateTime(timezone=True),
-            server_default=sa.text("(datetime('now'))"),
+            server_default=sa.text("CURRENT_TIMESTAMP"),
             nullable=False,
         ),
         sa.Column("total_files", sa.Integer(), nullable=True),
@@ -64,13 +64,13 @@ def upgrade() -> None:
         sa.Column(
             "created_at",
             sa.DateTime(timezone=True),
-            server_default=sa.text("(datetime('now'))"),
+            server_default=sa.text("CURRENT_TIMESTAMP"),
             nullable=False,
         ),
         sa.Column(
             "updated_at",
             sa.DateTime(timezone=True),
-            server_default=sa.text("(datetime('now'))"),
+            server_default=sa.text("CURRENT_TIMESTAMP"),
             nullable=False,
         ),
         sa.PrimaryKeyConstraint("id"),
@@ -107,7 +107,7 @@ def upgrade() -> None:
         sa.Column(
             "created_at",
             sa.DateTime(timezone=True),
-            server_default=sa.text("(datetime('now'))"),
+            server_default=sa.text("CURRENT_TIMESTAMP"),
             nullable=False,
         ),
         sa.ForeignKeyConstraint(
@@ -170,7 +170,7 @@ def upgrade() -> None:
         sa.Column(
             "assigned_at",
             sa.DateTime(timezone=True),
-            server_default=sa.text("(datetime('now'))"),
+            server_default=sa.text("CURRENT_TIMESTAMP"),
             nullable=False,
         ),
         sa.Column("assigned_by", sa.Integer(), nullable=True),
@@ -215,7 +215,7 @@ def upgrade() -> None:
         sa.Column(
             "created_at",
             sa.DateTime(timezone=True),
-            server_default=sa.text("(datetime('now'))"),
+            server_default=sa.text("CURRENT_TIMESTAMP"),
             nullable=False,
         ),
         sa.ForeignKeyConstraint(