refactor: modernize code quality tooling with Ruff

- Replace black, isort, and flake8 with Ruff (all-in-one linter and formatter)
- Add comprehensive pyproject.toml configuration
- Simplify Makefile code quality targets
- Configure exclusions for venv/.venv in pyproject.toml
- Auto-fix 1,359 linting issues across codebase

Benefits:
- Much faster builds (Ruff is written in Rust)
- Single tool replaces multiple tools
- More comprehensive rule set (UP, B, C4, SIM, PIE, RET, Q)
- All configuration centralized in pyproject.toml
- Better import sorting and formatting consistency

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

alembic/env.py

@@ -40,9 +40,13 @@ print("=" * 70)
 # ADMIN MODELS
 # ----------------------------------------------------------------------------
 try:
-    from models.database.admin import (AdminAuditLog, AdminNotification,
-                                       AdminSession, AdminSetting,
-                                       PlatformAlert)
+    from models.database.admin import (
+        AdminAuditLog,
+        AdminNotification,
+        AdminSession,
+        AdminSetting,
+        PlatformAlert,
+    )
 
     print("  ✓ Admin models imported (5 models)")
     print("    - AdminAuditLog")
@@ -176,8 +180,8 @@ except ImportError as e:
 # SUMMARY
 # ============================================================================
 print("=" * 70)
-print(f"[ALEMBIC] Model import completed")
-print(f"[ALEMBIC] Tables detected in metadata:")
+print("[ALEMBIC] Model import completed")
+print("[ALEMBIC] Tables detected in metadata:")
 print("=" * 70)
 
 if Base.metadata.tables: