feat: Initialize backend with Express and MySQL, and restructure frontend with new routing and language support.

.vite/deps/_metadata.json

@@ -0,0 +1,8 @@
+{
+  "hash": "a5aca759",
+  "configHash": "b6b52121",
+  "lockfileHash": "e3b0c442",
+  "browserHash": "5526a657",
+  "optimized": {},
+  "chunks": {}
+}

.vite/deps/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}