docs: add QQBot to all 14 docs pages (full platform parity)

- sidebars.ts: sidebar navigation entry
- webhooks.md: deliver field routing table
- configuration.md: platform keys list
- sessions.md: platform identifiers table
- features/cron.md: delivery target table
- developer-guide/architecture.md: adapter listing
- developer-guide/cron-internals.md: delivery target table
- developer-guide/gateway-internals.md: file tree listing
- guides/cron-troubleshooting.md: supported platforms list
- integrations/index.md: platform links list
- reference/toolsets-reference.md: toolset table

(qqbot.md, environment-variables.md, and messaging/index.md were
already included in the contributor's original PR)

website/docs/developer-guide/cron-internals.md

@@ -180,6 +180,7 @@ Cron job results can be delivered to any supported platform:
 | WeCom | `wecom` | Deliver to WeCom |
 | Weixin | `weixin` | Deliver to Weixin (WeChat) |
 | BlueBubbles | `bluebubbles` | Deliver to iMessage via BlueBubbles |
+| QQ Bot | `qqbot` | Deliver to QQ (Tencent) via Official API v2 |
 
 For Telegram topics, use the format `telegram:<chat_id>:<thread_id>` (e.g., `telegram:-1001234567890:17585`).