fix: cap Prisma pool during next build to stop deploy SSG timeouts

Next build workers were each opening up to DATABASE_POOL_SIZE connections and exhausting MySQL (pool active=0), hanging sitemap generation. Cap build pool to 5, fail connect faster, limit SSG concurrency, and make sitemap dynamic.

Co-authored-by: Cursor <[email protected]>

next.config.ts

@@ -44,6 +44,8 @@ const nextConfig: NextConfig = {
 			static: 180,
 		},
 		optimizePackageImports: ["lucide-react"],
+		// Keep build-time DB fan-out low (shared MySQL with emulator).
+		staticGenerationMaxConcurrency: 3,
 	},
 
 	// Add caching headers for static assets