debug: add env var check endpoint

apps/api/src/main.ts

@@ -20,6 +20,16 @@ async function bootstrap() {
     return { status: "ok", ts: new Date().toISOString() };
   });
 
+  // Debug - check env vars
+  fastify.get("/api/debug", async () => {
+    const keys = ["DATABASE_URL", "DEMO_MODE", "CLERK_SECRET_KEY", "AI_PROVIDER"];
+    const env: Record<string, string> = {};
+    for (const k of keys) {
+      env[k] = process.env[k] ? "SET" : "NOT_SET";
+    }
+    return { env };
+  });
+
   // Raw capabilities (NestJS controller returning 500 — unknown framework issue)
   fastify.get("/api/capabilities", async () => {
     return { capabilities: getCapabilities() };