Bootstrap copied BFF and local accounts with public Sendico contracts (#34)

backend/contracts/sendico/api/accounts/request/auth.yaml

@@ -0,0 +1,34 @@
+components:
+  schemas:
+    LoginRequest:
+      type: object
+      additionalProperties: false
+      required:
+        - login
+      properties:
+        clientId:
+          type: string
+          description: Client identifier bound to refresh token lifecycle and client policy checks.
+        deviceId:
+          type: string
+          description: Device/server identifier associated with the client session.
+        login:
+          $ref: ../../../models/auth/login_data.yaml#/components/schemas/LoginData
+
+    ApiLoginRequest:
+      allOf:
+        - $ref: ./auth.yaml#/components/schemas/LoginRequest
+        - type: object
+          additionalProperties: false
+          required:
+            - clientId
+            - deviceId
+            - clientSecret
+          properties:
+            clientSecret:
+              type: string
+              format: password
+              description: Client secret for `client_secret_post` authentication.
+
+    RefreshTokenRequest:
+      $ref: ../../../models/auth/client_refresh_token.yaml#/components/schemas/ClientRefreshToken