refactor file upload process to use MD5 instead of SHA-1 for hash calculation and update related API and model structures

frontend/package.json

@@ -10,7 +10,6 @@
     "preview": "vite preview"
   },
   "dependencies": {
-    "@aws-crypto/sha1-browser": "^5.2.0",
     "@marsidev/react-turnstile": "^1.1.0",
     "@tailwindcss/vite": "^4.1.5",
     "axios": "^1.9.0",
@@ -23,12 +22,14 @@
     "react-icons": "^5.5.0",
     "react-markdown": "^10.1.0",
     "react-router": "^7.5.3",
+    "spark-md5": "^3.0.2",
     "tailwindcss": "^4.1.5"
   },
   "devDependencies": {
     "@eslint/js": "^9.22.0",
     "@types/react": "^19.0.10",
     "@types/react-dom": "^19.0.4",
+    "@types/spark-md5": "^3.0.5",
     "@vitejs/plugin-react": "^4.3.4",
     "daisyui": "^5.0.35",
     "eslint": "^9.22.0",