fix: address code review findings from 2026-08-17

- scope no-cache headers to non-static routes (restore immutable asset caching)
- reset cached rejected MongoDB promise so retries can succeed
- use last X-Forwarded-For entry in Content Editor rate limiter (anti-spoofing)
- remove weak Mongo defaults from compose files (fail loudly on missing env)
- move staging banner text to common.json content
- read APP_PORT from env file in deploy.sh healthcheck
- filter network noise from staging smoke console assertions

Closes MITHOME-48, MITHOME-49, MITHOME-50, MITHOME-51, MITHOME-52, MITHOME-53, MITHOME-54

proto/src/app/layout.tsx

@@ -6,6 +6,7 @@ import Header from "../components/Header";
 import Footer from "../components/Footer";
 import { ThemeProvider } from "../components/ThemeProvider";
 import { siteConfig } from "../config/site";
+import { common } from "../content";
 
 const geistSans = Geist({
   variable: "--font-geist-sans",
@@ -93,7 +94,7 @@ export default function RootLayout({
         <ThemeProvider>
           {isStaging && (
             <div className="bg-amber-400 px-4 py-2 text-center text-xs font-extrabold tracking-[0.18em] text-amber-950 sm:text-sm">
-              ⚠ STAGING / TESZTKÖRNYEZET — A STAGING OLDALT LÁTOD
+              {common.staging.banner}
             </div>
           )}
           <Header />

proto/src/content/common.json

@@ -13,5 +13,8 @@
     "required": "Ez a mező kötelező",
     "invalidEmail": "Érvénytelen email cím formátum",
     "minLength": "Legalább {min} karakter szükséges"
+  },
+  "staging": {
+    "banner": "⚠ STAGING / TESZTKÖRNYEZET — A STAGING OLDALT LÁTOD"
   }
 }

proto/src/content/schema.js

@@ -14,6 +14,7 @@ const schemas = {
     buttons: object({ contact: string, learnMore: string, webmail: string, sendMessage: string }),
     labels: object({ required: string, features: string }),
     validation: object({ required: string, invalidEmail: string, minLength: string }),
+    staging: object({ banner: string }),
   }),
   home: object({
     hero: object({ title: string, subtitle: string, description: string, trustBullets: array(string), cta: object({ primary: ctaLink, secondary: ctaLink }) }),

proto/src/content/types.ts

@@ -190,6 +190,9 @@ export interface CommonContent {
     invalidEmail: string
     minLength: string
   }
+  staging: {
+    banner: string
+  }
 }
 
 export interface LegalPageContent {

proto/src/lib/mongodb.test.ts

@@ -139,5 +139,23 @@ describe('MongoDB Connection (Unit Tests)', () => {
       // Should be the same client instance
       expect(client1).toBe(client2)
     })
+
+    it('should not cache a rejected connection promise and retry on next call', async () => {
+      // First attempt fails (e.g. transient DB outage at startup)
+      const failingClient = {
+        connect: jest.fn().mockRejectedValueOnce(new Error('transient failure')),
+        db: jest.fn(),
+        close: jest.fn()
+      }
+      MockedMongoClient.mockImplementation(() => failingClient)
+
+      const { getClientPromise } = await import('./mongodb')
+
+      await expect(getClientPromise()).rejects.toThrow('transient failure')
+
+      // Second call must retry instead of replaying the cached rejection
+      failingClient.connect.mockResolvedValueOnce(failingClient as any)
+      await expect(getClientPromise()).resolves.toBe(failingClient)
+    })
   })
 })

proto/src/lib/mongodb.ts

@@ -24,13 +24,24 @@ export function getClientPromise(): Promise<MongoClient> {
     // @ts-expect-error - Global variable for development hot reload
     if (!global._mongoClientPromise) {
       // @ts-expect-error - Global variable for development hot reload
-      global._mongoClientPromise = createClientPromise()
+      global._mongoClientPromise = createClientPromise().catch((error: Error) => {
+        // A rejected promise must not stay cached: a transient failure would
+        // otherwise break every subsequent request in this process.
+        // @ts-expect-error - Global variable for development hot reload
+        global._mongoClientPromise = undefined
+        throw error
+      })
     }
     // @ts-expect-error - Global variable for development hot reload
     return global._mongoClientPromise
   }
 
-  clientPromise ??= createClientPromise()
+  clientPromise ??= createClientPromise().catch((error: Error) => {
+    // See the development branch above: drop the cached rejection so the next
+    // call can retry the connection.
+    clientPromise = undefined
+    throw error
+  })
   return clientPromise
 }