fix(api): throttle before auth, configurable proxy trust, no-store and a strict CSP

- ThrottlerGuard runs first, so requests with wrong tokens or API keys
  count against the rate limit before any database lookup.
- TRUST_PROXY (hop count or Express list) replaces the hard-coded 1.
- Every API answer except the public lot pages is Cache-Control: no-store
  without ETag; helmet sends default-src 'none' / frame-ancestors 'none'
  (Swagger keeps the page policy when enabled) and same-site CORP.
- Request log lines carry the path only - no query strings (the SSO
  callback's code and state no longer reach the logs).
- In production the server refuses to start without an https
  FRONTEND_ORIGIN or with COOKIE_SECURE=false.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Backend/src/app.module.ts

@@ -106,9 +106,11 @@ import { IdempotencyCleanupService } from './common/idempotency/idempotency-clea
   ],
   controllers: [],
   providers: [
+    // Throttle first: a request with a wrong token or API key must count
+    // against the limit too, before any database lookup is spent on it.
+    { provide: APP_GUARD, useClass: ThrottlerGuard },
     { provide: APP_GUARD, useClass: JwtAuthGuard },
     { provide: APP_GUARD, useClass: PermissionsGuard },
-    { provide: APP_GUARD, useClass: ThrottlerGuard },
     { provide: APP_INTERCEPTOR, useClass: IdempotencyInterceptor },
     IdempotencyCleanupService,
   ],