feat(feishu): support stream output (cardkit) (#2382)

* feat(feishu): add streaming support via CardKit PATCH API

Implement send_delta() for Feishu channel using interactive card
progressive editing:
- First delta creates a card with markdown content and typing cursor
- Subsequent deltas throttled at 0.5s to respect 5 QPS PATCH limit
- stream_end finalizes with full formatted card (tables, rich markdown)

Also refactors _send_message_sync to return message_id (str | None)
and adds _patch_card_sync for card updates.

Includes 17 new unit tests covering streaming lifecycle, config,
card building, and edge cases.

Made-with: Cursor

* feat(feishu): close CardKit streaming_mode on stream end

Call cardkit card.settings after final content update so chat preview
leaves default [生成中...] summary (Feishu streaming docs).

Made-with: Cursor

* style: polish Feishu streaming (PEP8 spacing, drop unused test imports)

Made-with: Cursor

* docs(feishu): document cardkit:card:write for streaming

- README: permissions, upgrade note for existing apps, streaming toggle
- CHANNEL_PLUGIN_GUIDE: Feishu CardKit scope and when to disable streaming

Made-with: Cursor

* docs: address PR 2382 review (test path, plugin guide, README, English docstrings)

- Move Feishu streaming tests to tests/channels/
- Remove Feishu CardKit scope from CHANNEL_PLUGIN_GUIDE (plugin-dev doc only)
- README Feishu permissions: consistent English
- feishu.py: replace Chinese in streaming docstrings/comments

Made-with: Cursor

README.md

@@ -505,14 +505,17 @@ nanobot gateway
 </details>
 
 <details>
-<summary><b>Feishu (飞书)</b></summary>
+<summary><b>Feishu</b></summary>
 
 Uses **WebSocket** long connection — no public IP required.
 
 **1. Create a Feishu bot**
 - Visit [Feishu Open Platform](https://open.feishu.cn/app)
 - Create a new app → Enable **Bot** capability
-- **Permissions**: Add `im:message` (send messages) and `im:message.p2p_msg:readonly` (receive messages)
+- **Permissions**:
+  - `im:message` (send messages) and `im:message.p2p_msg:readonly` (receive messages)
+  - **Streaming replies** (default in nanobot): add **`cardkit:card:write`** (often labeled **Create and update cards** in the Feishu developer console). Required for CardKit entities and streamed assistant text. Older apps may not have it yet — open **Permission management**, enable the scope, then **publish** a new app version if the console requires it.
+  - If you **cannot** add `cardkit:card:write`, set `"streaming": false` under `channels.feishu` (see below). The bot still works; replies use normal interactive cards without token-by-token streaming.
 - **Events**: Add `im.message.receive_v1` (receive messages)
   - Select **Long Connection** mode (requires running nanobot first to establish connection)
 - Get **App ID** and **App Secret** from "Credentials & Basic Info"
@@ -530,12 +533,14 @@ Uses **WebSocket** long connection — no public IP required.
       "encryptKey": "",
       "verificationToken": "",
       "allowFrom": ["ou_YOUR_OPEN_ID"],
-      "groupPolicy": "mention"
+      "groupPolicy": "mention",
+      "streaming": true
     }
   }
 }
 ```
 
+> `streaming` defaults to `true`. Use `false` if your app does not have **`cardkit:card:write`** (see permissions above).
 > `encryptKey` and `verificationToken` are optional for Long Connection mode.
 > `allowFrom`: Add your open_id (find it in nanobot logs when you message the bot). Use `["*"]` to allow all users.
 > `groupPolicy`: `"mention"` (default — respond only when @mentioned), `"open"` (respond to all group messages). Private chats always respond.