feat(gateway): unify QQBot branding, add PLATFORM_HINTS, fix streaming, restore missing setup functions

- Rename platform from 'qq' to 'qqbot' across all integration points
  (Platform enum, toolset, config keys, import paths, file rename qq.py → qqbot.py)
- Add PLATFORM_HINTS for QQBot in prompt_builder (QQ supports markdown)
- Set SUPPORTS_MESSAGE_EDITING = False to skip streaming on QQ
  (prevents duplicate messages from non-editable partial + final sends)
- Add _send_qqbot() standalone send function for cron/send_message tool
- Add interactive _setup_qq() wizard in hermes_cli/setup.py
- Restore missing _setup_signal/email/sms/dingtalk/feishu/wecom/wecom_callback
  functions that were lost during the original merge

website/docs/user-guide/messaging/index.md

@@ -30,7 +30,7 @@ For the full voice feature set — including CLI microphone mode, spoken replies
 | WeCom Callback | — | — | — | — | — | — | — |
 | Weixin | ✅ | ✅ | ✅ | — | — | ✅ | ✅ |
 | BlueBubbles | — | ✅ | ✅ | — | ✅ | ✅ | — |
-| QQ | ✅ | ✅ | ✅ | — | — | — | — |
+| QQ | ✅ | ✅ | ✅ | — | — | ✅ | — |
 
 **Voice** = TTS audio replies and/or voice message transcription. **Images** = send/receive images. **Files** = send/receive file attachments. **Threads** = threaded conversations. **Reactions** = emoji reactions on messages. **Typing** = typing indicator while processing. **Streaming** = progressive message updates via editing.
 
@@ -82,6 +82,7 @@ flowchart TB
     wcb --> store
     wx --> store
     bb --> store
+    qq --> store
     api --> store
     wh --> store
     store --> agent
@@ -371,7 +372,7 @@ Each platform has its own toolset:
 | WeCom Callback | `hermes-wecom-callback` | Full tools including terminal |
 | Weixin | `hermes-weixin` | Full tools including terminal |
 | BlueBubbles | `hermes-bluebubbles` | Full tools including terminal |
-| QQ | `hermes-qq` | Full tools including terminal |
+| QQBot | `hermes-qqbot` | Full tools including terminal |
 | API Server | `hermes` (default) | Full tools including terminal |
 | Webhooks | `hermes-webhook` | Full tools including terminal |
 
@@ -393,6 +394,6 @@ Each platform has its own toolset:
 - [WeCom Callback Setup](wecom-callback.md)
 - [Weixin Setup (WeChat)](weixin.md)
 - [BlueBubbles Setup (iMessage)](bluebubbles.md)
-- [QQ Bot Setup](qq.md)
+- [QQBot Setup](qqbot.md)
 - [Open WebUI + API Server](open-webui.md)
 - [Webhooks](webhooks.md)