docs: fix inaccuracies, add translations, and expand channel docs (#1837)

## Config field fixes (cross-verified against Go source)
- MaixCam: server_address → host + port
- IRC: use_tls → tls, channels_to_join → channels (all 6 languages)
- WeCom AI Bot: callback port 18791 → 18790
- credential_encryption: base_url → api_base, add required model field,
  remove incorrect passphrase-only mode docs
- providers.md: agents.defaults.model → model_name (×4), remove
  non-existent session.backlog_limit
- migration guide, troubleshooting: agents.defaults.model → model_name
- ANTIGRAVITY_AUTH: fix file path, Go 1.21 → 1.25, model → model_name
- spawn-tasks: fix truncated file, add Heartbeat introduction
- tools_configuration: add Tavily/SearXNG/GLMSearch, exec allow_remote/
  timeout_seconds/custom_allow_patterns, cron allow_command, skills
  github/search_cache, clawhub timeout/max_zip_size/max_response_size
- configuration: fix builtin skills path (build-time embedded, not cwd),
  HEARTBEAT.md marked auto-generated

## Broken link fixes (15 total)
- chat-apps.md: WeCom/Matrix links with wrong relative paths
- providers.md: migration link with extra docs/ prefix
- hardware-compatibility.md: README links with wrong depth (all 5 langs)
- chat-apps.md: WhatsApp dead links → anchor links (zh/ja)

## Getting-started accuracy
- README (all 6 langs): add picoclaw.io as recommended download,
  add missing picoclaw model CLI command
- docker.md: clarify first-run trigger condition (all 6 langs)
- configuration.md: fix builtin skills path description (all 6 langs)

## QQ channel
- Add quick setup via q.qq.com/qqbot/openclaw (one-click bot creation)
- Add manual setup as fallback (all 6 languages)

## Feishu channel
- Update setup flow: WebSocket/SDK mode, no webhook URL needed
- Preserve Lark international domain note (all 6 languages)

## chat-apps.md
- Add Feishu, Slack, IRC, OneBot detail sections (all 6 languages)
- Add MaixCam section to ja/fr/pt-br/vi
- Fix all channel doc links to point to correct language version

## New translations (25 files, 5 docs × 5 languages)
debug.md, credential_encryption.md, hardware-compatibility.md,
ANTIGRAVITY_AUTH.md, ANTIGRAVITY_USAGE.md → zh/ja/fr/pt-br/vi

## Channel docs (6 languages each, 60 new files)
telegram, discord, qq, feishu, maixcam, dingtalk, line, slack, onebot,
wecom/wecom_aibot, wecom/wecom_app, wecom/wecom_bot

Co-authored-by: BeaconCat <BeaconCat@users.noreply.github.com>

docs/channels/qq/README.md

@@ -0,0 +1,54 @@
+> Back to [README](../../../README.md)
+
+# QQ
+
+PicoClaw provides QQ support via the official Bot API from the QQ Open Platform.
+
+## Configuration
+
+```json
+{
+  "channels": {
+    "qq": {
+      "enabled": true,
+      "app_id": "YOUR_APP_ID",
+      "app_secret": "YOUR_APP_SECRET",
+      "allow_from": []
+    }
+  }
+}
+```
+
+| Field      | Type   | Required | Description                                              |
+| ---------- | ------ | -------- | -------------------------------------------------------- |
+| enabled    | bool   | Yes      | Whether to enable the QQ channel                         |
+| app_id     | string | Yes      | App ID of the QQ bot application                         |
+| app_secret | string | Yes      | App Secret of the QQ bot application                     |
+| allow_from | array  | No       | Allowlist of user IDs; empty means all users are allowed |
+
+## Setup
+
+### Quick Setup (Recommended)
+
+The QQ Open Platform provides a one-click creation entry:
+
+1. Open [QQ Bot Quick Create](https://q.qq.com/qqbot/openclaw/index.html) and log in by scanning the QR code
+2. The system automatically creates a bot — copy the **App ID** and **App Secret**
+3. Fill in the credentials in the PicoClaw configuration file
+4. Run `picoclaw gateway` to start the service
+5. Open QQ and start chatting with the bot
+
+> The App Secret is only shown once — save it immediately. Viewing it again will force a reset.
+>
+> Bots created via the quick entry are for the creator's personal use only and do not support group chats. For group chat support, configure sandbox mode on the [QQ Open Platform](https://q.qq.com/).
+
+### Manual Setup
+
+1. Log in to the [QQ Open Platform](https://q.qq.com/) with your QQ account and register as a developer
+2. Create a QQ bot and customize its avatar and name
+3. Obtain the **App ID** and **App Secret** from the bot settings
+4. Fill in the credentials in the PicoClaw configuration file
+5. Run `picoclaw gateway` to start the service
+6. Search for your bot in QQ and start chatting
+
+> During development, it is recommended to enable sandbox mode and add test users and groups to the sandbox for debugging.