fix: rename dialog_id to chat_id in chat_channel (backend + frontend) (#16096)

## Summary

- The `ChatChannel` DB column was renamed from `dialog_id` to `chat_id`
via a migration (added in a prior commit).
- Aligns the REST API layer (`chat_channel_api.py`,
`chat_channel_service.py`) to use `chat_id` consistently.
- Updates the frontend (`interface.ts`, `hooks.ts`,
`connect-dialog-modal.tsx`, `added-channel-card.tsx`) to read/write
`chat_id` instead of `dialog_id`.
- The joined `dialog_name` alias in the list query is unchanged (backend
still returns it under that name).

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

api/db/services/chat_channel_service.py

@@ -34,7 +34,7 @@ class ChatChannelService(CommonService):
             cls.model.id,
             cls.model.name,
             cls.model.channel,
-            cls.model.dialog_id,
+            cls.model.chat_id,
             cls.model.status,
             Dialog.name.alias("dialog_name"),
         ]
@@ -43,7 +43,7 @@ class ChatChannelService(CommonService):
             .join(
                 Dialog,
                 join_type=JOIN.LEFT_OUTER,
-                on=(Dialog.id == cls.model.dialog_id),
+                on=(Dialog.id == cls.model.chat_id),
             )
             .where(cls.model.tenant_id == tenant_id)
             .order_by(cls.model.create_time.desc())