Initial commit: Shop Database Flask Application

Flask backend with Vue 3 frontend for shop floor machine management.
Includes database schema export for MySQL shopdb_flask database.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

shopdb/extensions.py

@@ -0,0 +1,25 @@
+"""Flask extensions initialization."""
+
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
+from flask_jwt_extended import JWTManager
+from flask_cors import CORS
+from flask_marshmallow import Marshmallow
+
+# Initialize extensions without app
+db = SQLAlchemy()
+migrate = Migrate()
+jwt = JWTManager()
+cors = CORS()
+ma = Marshmallow()
+
+
+def init_extensions(app):
+    """Initialize all Flask extensions with app."""
+    db.init_app(app)
+    migrate.init_app(app, db)
+    jwt.init_app(app)
+    cors.init_app(app, resources={
+        r"/api/*": {"origins": app.config.get('CORS_ORIGINS', '*')}
+    })
+    ma.init_app(app)