removed all references to credits. now credits are completely replaced by addons.

docs/archive/prp/tenant-app-specs/api-usage.md

@@ -154,32 +154,6 @@ Diese Dokumentation beschreibt alle API-Endpunkte der Tenant Admin App. Alle Req
 
 ## Billing
 
-### Balance laden
-- **GET /api/v1/tenant/credits/balance**
-  - **Headers**: `Authorization: Bearer \{token\}`
-  - **Response**: `{ balance: number }`
-
-### Ledger-Verlauf
-- **GET /api/v1/tenant/credits/ledger**
-  - **Headers**: `Authorization: Bearer \{token\}`
-  - **Params**: `page`, `per_page` (Pagination)
-  - **Response**: `{ data: LedgerEntry[], current_page, last_page }`
-  - **LedgerEntry**: `{ id, type, amount, credits, date, description, transactionId? }`
-
-### Credits kaufen (In-App)
-- **POST /api/v1/tenant/credits/purchase**
-  - **Headers**: `Authorization: Bearer \{token\}`, `Content-Type: application/json`
-  - **Body**: `{ package_id: string, credits_added: number, platform?: 'capacitor'|'web', transaction_id?: string, subscription_active?: boolean }`
-  - **Response**: `{ message, balance, subscription_active }`
-  - **Hinweis**: Wird nach erfolgreichen In-App-Kuferfolgen aufgerufen, aktualisiert Balance & Ledger.
-
-### Credits synchronisieren
-- **POST /api/v1/tenant/credits/sync**
-  - **Headers**: `Authorization: Bearer \{token\}`, `Content-Type: application/json`
-  - **Body**: `{ balance: number, subscription_active: boolean, last_sync: ISODateString }`
-  - **Response**: `{ balance, subscription_active, server_time }`
-  - **Hinweis**: Client meldet lokalen Stand; Server gibt Quelle-der-Wahrheit zurcck.
-
 ### Kauf-Intent erstellen
 - **POST /api/v1/tenant/purchases/intent**
   - **Headers**: `Authorization: Bearer \{token\}`, `Content-Type: application/json`