Docs: add zh-CN entrypoint translations (#6300)

* Docs: add zh-CN entrypoint translations

* Docs: harden docs-i18n parsing

docs/.i18n/README.md

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+# OpenClaw docs i18n assets
+
+This folder stores **generated** and **config** files for documentation translations.
+
+## Files
+
+- `glossary.<lang>.json` — preferred term mappings (used in prompt guidance).
+- `<lang>.tm.jsonl` — translation memory (cache) keyed by workflow + model + text hash.
+
+## Glossary format
+
+`glossary.<lang>.json` is an array of entries:
+
+```json
+{
+  "source": "troubleshooting",
+  "target": "故障排除",
+  "ignore_case": true,
+  "whole_word": false
+}
+```
+
+Fields:
+- `source`: English (or source) phrase to prefer.
+- `target`: preferred translation output.
+
+## Notes
+
+- Glossary entries are passed to the model as **prompt guidance** (no deterministic rewrites).
+- The translation memory is updated by `scripts/docs-i18n`.

docs/.i18n/glossary.zh-CN.json

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+[
+  {
+    "source": "OpenClaw",
+    "target": "OpenClaw"
+  },
+  {
+    "source": "Gateway",
+    "target": "Gateway"
+  },
+  {
+    "source": "Pi",
+    "target": "Pi"
+  },
+  {
+    "source": "agent",
+    "target": "智能体"
+  },
+  {
+    "source": "channel",
+    "target": "渠道"
+  },
+  {
+    "source": "session",
+    "target": "会话"
+  },
+  {
+    "source": "provider",
+    "target": "提供商"
+  },
+  {
+    "source": "model",
+    "target": "模型"
+  },
+  {
+    "source": "tool",
+    "target": "工具"
+  },
+  {
+    "source": "CLI",
+    "target": "CLI"
+  },
+  {
+    "source": "install sanity",
+    "target": "安装完整性检查"
+  },
+  {
+    "source": "get unstuck",
+    "target": "快速排障"
+  },
+  {
+    "source": "troubleshooting",
+    "target": "故障排除"
+  },
+  {
+    "source": "FAQ",
+    "target": "常见问题"
+  },
+  {
+    "source": "onboarding",
+    "target": "上手引导"
+  },
+  {
+    "source": "wizard",
+    "target": "向导"
+  },
+  {
+    "source": "environment variables",
+    "target": "环境变量"
+  },
+  {
+    "source": "environment variable",
+    "target": "环境变量"
+  },
+  {
+    "source": "env vars",
+    "target": "环境变量"
+  },
+  {
+    "source": "env var",
+    "target": "环境变量"
+  }
+]