Introduce Project ID for context management, finalizing the stateful API pipeline from file submission to graph construction.

backend/app/__init__.py

@@ -0,0 +1,52 @@
+"""
+MiroFish Backend - Flask应用工厂
+"""
+
+from flask import Flask, request
+from flask_cors import CORS
+
+from .config import Config
+from .utils.logger import setup_logger, get_logger
+
+
+def create_app(config_class=Config):
+    """Flask应用工厂函数"""
+    app = Flask(__name__)
+    app.config.from_object(config_class)
+    
+    # 设置日志
+    logger = setup_logger('mirofish')
+    logger.info("=" * 50)
+    logger.info("MiroFish Backend 启动中...")
+    logger.info("=" * 50)
+    
+    # 启用CORS
+    CORS(app, resources={r"/api/*": {"origins": "*"}})
+    
+    # 请求日志中间件
+    @app.before_request
+    def log_request():
+        logger = get_logger('mirofish.request')
+        logger.debug(f"请求: {request.method} {request.path}")
+        if request.content_type and 'json' in request.content_type:
+            logger.debug(f"请求体: {request.get_json(silent=True)}")
+    
+    @app.after_request
+    def log_response(response):
+        logger = get_logger('mirofish.request')
+        logger.debug(f"响应: {response.status_code}")
+        return response
+    
+    # 注册蓝图
+    from .api import graph_bp
+    app.register_blueprint(graph_bp, url_prefix='/api/graph')
+    
+    # 健康检查
+    @app.route('/health')
+    def health():
+        return {'status': 'ok', 'service': 'MiroFish Backend'}
+    
+    logger.info("MiroFish Backend 启动完成")
+    
+    return app
+