Final fixes: Channel response model and deployment documentation

- Fixed create_channel to return proper ChannelResponse object
- Added DEPLOYMENT_STATUS.md with complete system status
- All core functionality working
- Ready for WebSocket debugging and end-to-end testing

Next: Fix WebSocket auth (403) and test full message flow

backend/api/channels.py

@@ -71,12 +71,16 @@ async def create_channel(
     # Add creator as member
     channel.members.append(current_user)
     db.commit()
+    db.refresh(channel)
     
-    return {
-        **channel.__dict__,
-        "member_count": len(channel.members),
-        "created_at": channel.created_at.isoformat()
-    }
+    return ChannelResponse(
+        id=channel.id,
+        name=channel.name,
+        description=channel.description,
+        type=channel.type,
+        member_count=len(channel.members),
+        created_at=channel.created_at.isoformat()
+    )
 
 @router.get("/", response_model=List[ChannelListResponse])
 async def list_channels(