IGDB integration: auto-scrape on upload + manual scrape button

- New IgdbService: Twitch OAuth2, IGDB API v4 search, cover download
- Upload auto-scrapes IGDB after extracting game ZIP
- GameDetail page: 'Auto Scrape' + 'Search' buttons + result picker
- Upload dialog: optional title field (defaults to filename)
- Jackson SNAKE_CASE naming to match frontend expectations
- IGDB status endpoint to check credentials

frontend/src/lib/api.js

@@ -59,9 +59,35 @@ export async function uploadGame(file, title) {
   return res.json();
 }
 
-/** Search IGDB (placeholder) */
+/** Search IGDB for a game title (requires TWITCH_CLIENT_ID/SECRET set) */
 export async function searchIGDB(query) {
-  return request(`/api/igdb/search?query=${encodeURIComponent(query)}`);
+  const res = await fetch(`${BASE}/api/igdb/search?q=${encodeURIComponent(query)}`);
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({ error: res.statusText }));
+    throw new Error(err.error || `HTTP ${res.status}`);
+  }
+  return res.json();
+}
+
+/** Apply IGDB metadata + cover to a game (auto or by igdb_id) */
+export async function scrapeIGDB(gameId, igdbId) {
+  const body = igdbId ? { igdb_id: igdbId } : {};
+  const res = await fetch(`${BASE}/api/igdb/scrape/${gameId}`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify(body),
+  });
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({ error: res.statusText }));
+    throw new Error(err.error || `HTTP ${res.status}`);
+  }
+  return res.json();
+}
+
+/** Check IGDB status */
+export async function igdbStatus() {
+  const res = await fetch(`${BASE}/api/igdb/status`);
+  return res.json();
 }
 
 /** Get artwork URL for a path — returns proxy URL or placeholder */