refactor: Update response types to use common schemas across API endpoints

app/schemas/common.py

@@ -0,0 +1,21 @@
+"""Common response schemas."""
+
+from pydantic import BaseModel, Field
+
+
+class MessageResponse(BaseModel):
+    """Generic message response."""
+
+    message: str = Field(description="Response message")
+
+
+class StatusResponse(BaseModel):
+    """Generic status response."""
+
+    status: str = Field(description="Status message")
+
+
+class HealthResponse(BaseModel):
+    """Health check response."""
+
+    status: str = Field(description="Health status")