feat: 添加自定义404和403错误响应，并优化图像服务接口逻辑

screenshots_flask.py

@@ -1,17 +1,8 @@
-from flask import Flask, send_file, abort
+from flask import Flask, send_file, abort, request, jsonify
 from pathlib import Path
 
 app = Flask(__name__)
 
-# 固定 screenshots 目录
-PROJECT_ROOT = Path(__file__).parent.resolve()
-SCREENSHOTS_DIR = PROJECT_ROOT / "screenshots"
-
-
-@app.route('/image/<path:filename>')
-def serve_image(filename):
-    app = Flask(__name__)
-
 PROJECT_ROOT = Path(__file__).parent.resolve()
 SCREENSHOTS_DIR = PROJECT_ROOT / "screenshots"
 
@@ -30,6 +21,15 @@ def serve_image(filename):
 
     return send_file(file_path, as_attachment=False)
 
+# 自定义 404 错误响应
+@app.errorhandler(404)
+def handle_404(e):
+    return f"404 错误：{e.description}", 404
+
+# 自定义 403 错误响应
+@app.errorhandler(403)
+def handle_403(e):
+    return f"403 错误：{e.description}", 403
 
 if __name__ == '__main__':
-    app.run(host='0.0.0.0', debug=True, port=5000)
+    app.run(host='0.0.0.0', debug=False, port=5000)