Feat: chat channels — connect assistants to external messaging bots (#15850)

### What problem does this PR solve?

#15844

Adds a **Chat channels** capability so a RAGFlow assistant (Dialog) can
be exposed as a bot on external messaging platforms (Feishu/Lark,
Discord, Telegram, Slack, WeCom, LINE, etc.). An admin configures a bot
in the UI, connects it to an assistant, and inbound messages are
answered from that assistant's knowledge base — replies are delivered
back on the channel.

**Feishu/Lark is implemented and tested end-to-end.** Discord, Telegram,
LINE, and WeCom are scaffolded against the same interface; the remaining
listed channels are tracked as follow-ups.

### Design

**Backend**
- New `chat_channel` table (`tenant_id`, `name`, `channel`, `config`
JSON holding `{credential: {...}}`, `dialog_id`, `status`) +
`ChatChannelService` and RESTful CRUD under `/api/v1/chat_channels`.
- Channel framework under `api/channels/`: a `core` registry +
per-channel packages that self-register a builder and implement a common
`Channel` interface (`start`/`stop`/`send` + inbound normalization) over
`IncomingMessage`/`OutgoingMessage`.
- Embedded **reconcile loop** in `ragflow_server`
(`api/channels/bootstrap.py`): loads enabled bots, and
starts/stops/restarts them as rows change (no server restart needed).
Inbound messages run the connected dialog via the non-streaming
completion path, keeping per-end-user conversation history.
- Missing optional channel SDKs degrade gracefully (channel skipped with
a warning; others unaffected). Channel-level errors are logged, not
crashed.
- Feishu's WebSocket client runs in a dedicated thread with its own
event loop to avoid cross-loop/contextvars conflicts with the channel
runtime.

**Frontend**
- **Settings → Chat channels** panel: available-channels grid +
configured-bots list with add/edit/delete and a **Connect assistant**
popup that binds a bot to a dialog.
- Brand icons via simple-icons / reused shared data-source assets, with
colored fallbacks for brands not available.
- Route, sidebar entry, i18n (en/zh), and a top-nav segment-boundary fix
so the settings page no longer highlights the Chat tab.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### Notes
- DB: new `chat_channel` table is auto-created; `chat_channel.dialog_id`
is also covered by a `migrate_db` `alter_db_add_column` for existing
installs.
- Channel SDKs (`lark-oapi`, `discord.py`, `python-telegram-bot`,
`line-bot-sdk`, `wechatpy`, `aiohttp`) added to dependencies.
- Screenshots / per-channel credential docs to follow.

<img width="1338" height="1290" alt="Image"
src="https://github.com/user-attachments/assets/042cb2f9-0dad-4e6a-bcf7-43ced4bbd704"
/>

<img width="1344" height="738" alt="Image"
src="https://github.com/user-attachments/assets/373cd08e-ec40-4c67-9c51-4d948b1ba617"
/>

<img width="672" height="887" alt="Image"
src="https://github.com/user-attachments/assets/5a34953f-a9a3-4c1e-869e-5eff0dc64c84"
/>

---------

README_tr.md

@@ -87,6 +87,7 @@ Bulut hizmetimizi [https://cloud.ragflow.io](https://cloud.ragflow.io) adresinde
 
 ## 🔥 Son Güncellemeler
 
+- 2026-06-15 Feishu, Discord, Telegram, Line vb. gibi birden fazla sohbet kanalını destekleyin.
 - 2026-04-24 DeepSeek v4 desteği.
 - 2026-03-24 [RAGFlow Skill on OpenClaw](https://clawhub.ai/yingfeng/ragflow-skill) — OpenClaw üzerinden RAGFlow veri setlerine erişmek için resmi bir skill sağlar.
 - 2025-12-26 Yapay zeka ajanı için 'Bellek' desteği eklendi.
@@ -97,7 +98,6 @@ Bulut hizmetimizi [https://cloud.ragflow.io](https://cloud.ragflow.io) adresinde
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 - 2025-08-01 Ajanlı iş akışı ve MCP desteği eklendi.
 - 2025-05-23 Ajana Python/JavaScript kod çalıştırıcı bileşeni eklendi.
-- 2025-05-05 Diller arası sorgu desteği eklendi.
 - 2025-03-19 PDF veya DOCX dosyalarındaki görselleri yorumlamak için çok modlu model desteği eklendi.
 
 ## 🎉 Bizi Takip Edin