Add per-user detail pages with activity chart and request history

Each user in the leaderboard links to a profile page showing stat cards,
a line chart (requests / storage / watch hours, 1W–1Y timeframes, raw or
normalized, plus a Storage Load mode), and a full request history sorted
newest-first. Includes Overseerr media status codes (1–5), Tautulli watch
history aggregation, and a server-side raw cache so the user API route can
enrich requests without re-fetching everything.

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

package.json

@@ -11,7 +11,8 @@
     "better-sqlite3": "^12.8.0",
     "next": "16.2.3",
     "react": "19.2.4",
-    "react-dom": "19.2.4"
+    "react-dom": "19.2.4",
+    "recharts": "^3.8.1"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",