fix: secure file routes and dependency management

back/middlewares/protectedPathCase.ts

@@ -0,0 +1,23 @@
+import type { NextFunction, Request, Response } from 'express';
+
+export default function protectedPathCase(
+  req: Request,
+  res: Response,
+  next: NextFunction,
+) {
+  const originalPath = req.path;
+  const normalizedPath = originalPath.toLowerCase();
+
+  if (
+    originalPath !== normalizedPath &&
+    (normalizedPath.startsWith('/api/') ||
+      normalizedPath.startsWith('/open/'))
+  ) {
+    return res.status(400).json({
+      code: 400,
+      message: 'Invalid path format',
+    });
+  }
+
+  return next();
+}