Merge db-migrations: Add Flask-Migrate support and clean up old migration system

apply_migration.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+"""Apply database migrations with Flask-Migrate"""
+
+from flask_migrate import upgrade
+from app import app, db
+
+if __name__ == '__main__':
+    with app.app_context():
+        print("Applying migrations...")
+        try:
+            upgrade()
+            print("Migrations applied successfully!")
+        except Exception as e:
+            print(f"Error applying migrations: {e}")
+            import traceback
+            traceback.print_exc()