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

backend/contracts/sendico/api/response/status.yaml

@@ -0,0 +1,10 @@
+components:
+  schemas:
+    ApiStatus:
+      type: string
+      description: Unified response status used by backend wrappers.
+      enum:
+        - success
+        - processed
+        - error
+        - request