feat(metadata): add Kobo metadata provider

Add Kobo as a first-class metadata source so books can keep Kobo IDs across fetch, edit, import, scoring, and file-write flows. Provide the Python cloudscraper setup needed for production fetches while keeping local setup explicit.

Closes #247

server/package.json

@@ -14,6 +14,7 @@
     "url": "https://github.com/bookorbit/bookorbit/issues"
   },
   "scripts": {
+    "setup:kobo-cloudscraper": "tsx src/scripts/setup-kobo-cloudscraper.ts",
     "prestart": "pnpm --filter @bookorbit/types build",
     "prestart:dev": "pnpm --filter @bookorbit/types build",
     "prestart:debug": "pnpm --filter @bookorbit/types build",