Include data/rank.db in Next.js serverless function trace

Without outputFileTracingIncludes, Next.js's static analysis can't
follow the runtime-computed path in lib/db.ts, so the DB file was
missing from the Vercel function bundle — committed re-seeds weren't
reaching prod. Matches all routes since 5 of them read the DB.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hsnice16

next.config.ts

@@ -1,5 +1,12 @@
 import type { NextConfig } from "next";
 
-const config: NextConfig = {};
+// lib/db.ts opens data/rank.db via `join(process.cwd(), ...)`, which Next.js's
+// static file tracer can't follow — without this, the DB is missing from the
+// serverless function bundle on Vercel and /api/repos returns stale data.
+const config: NextConfig = {
+  outputFileTracingIncludes: {
+    "*": ["./data/rank.db"],
+  },
+};
 
 export default config;