feat(cdn): integrate CDN Manager into the application

- Updated environment configurations to include CDN Manager in the RETURN_TO_ALLOWLIST.
- Enhanced target app resolution to recognize CDN-related hosts.
- Added CDN Manager to the application switcher and updated relevant documentation.
- Included tests to verify the correct mapping of CDN hosts.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/integrate-audit-ingest.md

@@ -36,7 +36,7 @@ Content-Type: application/json
 ```
 
 - `events`: 1–50 за запрос  
-- `source_app`: `vps` | `cfdm` | `bgp` | `fw` (не `portal`)  
+- `source_app`: `vps` | `cfdm` | `bgp` | `fw` | `dns` | `cdn` (не `portal`)  
 - `event_id`: идемпотентность (дубликаты → `duplicates++`)  
 - Ответ: `{ "accepted": N, "duplicates": M }`
 
@@ -45,7 +45,7 @@ Content-Type: application/json
 | Где | Переменная |
 |-----|------------|
 | auth-portal | `AUDIT_INGEST_SECRET` |
-| apps (vps / cfdm / bgp / fw) | `AUTH_PORTAL_URL` + `AUTH_AUDIT_INGEST_SECRET` (тот же секрет) |
+| apps (vps / cfdm / bgp / fw / cdn) | `AUTH_PORTAL_URL` + `AUTH_AUDIT_INGEST_SECRET` (тот же секрет) |
 
 Dev default secret: `dev-audit-ingest-secret`.