perf: docker + next.js build optimisation - dockerignore exclusions, BuildKit cache mounts, backend image reuse, memory limits, next.js bundle tree-shaking

next.config.ts

@@ -11,6 +11,34 @@ const API_BASE =
 
 const nextConfig: NextConfig = {
   output: "standalone",
+
+  // ── Performance: strip X-Powered-By header ──────────────────────────────
+  poweredByHeader: false,
+
+  // ── Performance: gzip compression handled by Next.js standalone server ──
+  compress: true,
+
+  // ── Compiler optimisations ───────────────────────────────────────────────
+  compiler: {
+    // Remove console.log statements from production builds
+    removeConsole: process.env.NODE_ENV === "production"
+      ? { exclude: ["error", "warn"] }
+      : false,
+  },
+
+  // ── Tree-shake large packages (only import what is used) ─────────────────
+  // This tells Next.js to side-effect-free import specific packages,
+  // significantly reducing the bundle size for heavy libraries.
+  experimental: {
+    optimizePackageImports: [
+      "lucide-react",
+      "recharts",
+      "framer-motion",
+      "date-fns",
+    ],
+  },
+
+  // ── API proxy rewrites ───────────────────────────────────────────────────
   async rewrites() {
     return [
       {