feat: add SMTP auth support for K3s migration

- Support SMTP_USER/SMTP_PASS env vars for authenticated SMTP
- Support SMTP_FROM env var for configurable sender address
- Auto-detect secure mode for port 465
- Backwards compatible: falls back to unauthenticated local relay

src/index.ts

@@ -54,7 +54,7 @@ app.use(compression());
 app.use((req, res, next) => {
   const isAuthBillingRoute = req.path.startsWith('/v1/signup') || 
                              req.path.startsWith('/v1/recover') || 
-                             req.path.startsWith('/v1/billing') ||
+                             req.path.startsWith('/v1/billing');
   
   if (isAuthBillingRoute) {
     res.setHeader("Access-Control-Allow-Origin", "https://docfast.dev");
@@ -184,12 +184,17 @@ app.get("/favicon.ico", (_req, res) => {
   res.sendFile(path.join(__dirname, "../public/favicon.svg"));
 });
 
-app.use(express.static(path.join(__dirname, "../public"), { 
-  maxAge: "1d", 
-  etag: true,
-  setHeaders: (res) => {
-    res.setHeader('Cache-Control', 'public, max-age=86400');
+// Static asset cache headers middleware
+app.use((req, res, next) => {
+  if (/\.(css|js|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$/.test(req.path)) { console.log("CACHE HIT:", req.path);
+    res.setHeader('Cache-Control', 'public, max-age=604800, immutable');
   }
+  next();
+});
+
+app.use(express.static(path.join(__dirname, "../public"), { 
+  etag: true,
+  cacheControl: false,
 }));
 
 // Docs page (clean URL)