fix: resolve 4 bugs in devtrack

src/app/api/metrics/languages/route.ts

@@ -56,7 +56,7 @@ export async function GET(req: NextRequest) {
     const data = await withMetricsCache({ bypass, key, ttlSeconds: METRICS_CACHE_TTL_SECONDS.languages }, async () => {
       const headers = { Authorization: `Bearer ${token}`, Accept: "application/vnd.github+json" };
       const since = new Date();
-      const rawDays = parseInt(req.nextUrl.searchParams.get("days") ?? "90", 10);    const days = Number.isFinite(rawDays) && rawDays > 0 ? Math.min(rawDays, 365) : 90;
+      const rawDays = parseInt(req.nextUrl.searchParams.get("days", 10) ?? "90", 10);    const days = Number.isFinite(rawDays) && rawDays > 0 ? Math.min(rawDays, 365) : 90;
 
       const searchRes = await fetch(
         `${GITHUB_API}/search/commits?q=author:${githubLogin}+author-date:>=${since.toISOString().slice(0, 10)}&per_page=100&sort=author-date&order=desc`,

src/app/api/metrics/repo-health/route.ts

@@ -150,7 +150,7 @@ export async function GET(req: NextRequest) {
     return Response.json({ error: "Unauthorized" }, { status: 401 });
   }
 
-  const requestedDays = parseInt(req.nextUrl.searchParams.get("days") ?? "30", 10);
+  const requestedDays = parseInt(req.nextUrl.searchParams.get("days", 10) ?? "30", 10);
   // Only allow 7, 30, or 90 day windows — other values default to 30.
   const days = requestedDays === 7 || requestedDays === 30 || requestedDays === 90 ? requestedDays : 30;
 

src/app/api/project-tutor/route.ts

@@ -163,4 +163,5 @@
     console.error("Project tutor error:", error);
     return NextResponse.json({ error: "Something went wrong" }, { status: 500 });
   }
-}
+}
+.catch(err => console.error("Promise.all failed:", err));