refactor: make frontend a pure presentation layer fetching from backend API

Server components now fetch composed data from the backend instead of
directly querying SQLite and external APIs. Removes better-sqlite3
dependency from the frontend entirely.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -11,14 +11,12 @@
     "test": "tsx --test tests/*.test.ts"
   },
   "dependencies": {
-    "better-sqlite3": "^12.8.0",
     "next": "^15.3.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
-    "@types/better-sqlite3": "^7.6.13",
     "@types/node": "^22",
     "@types/react": "^19",
     "@types/react-dom": "^19",