feat: bundle browser dependencies locally

package.json

@@ -4,7 +4,7 @@
   "version": "0.1.0",
   "type": "module",
   "scripts": {
-    "build": "tsc -p tsconfig.json",
+    "build": "tsc -p tsconfig.json && node dist/shared/copy-vendor-assets.js",
     "dev": "node --watch dist/index.js",
     "start": "node dist/index.js",
     "test": "npm run build && node --test dist/server/nextcloud-proxy.test.js",
@@ -16,5 +16,9 @@
   "devDependencies": {
     "@types/node": "^22.0.0",
     "typescript": "^5.0.0"
+  },
+  "dependencies": {
+    "exifr": "^7.1.3",
+    "leaflet": "^1.9.4"
   }
 }