feat: 新增代码智能内置技能 (#61)

## 变更摘要

- 新增中英文 `code-intelligence` 内置技能，按需暴露隐藏的 `Lsp` 工具
- 记录 9 种语义导航操作、目录权限边界、缺少语言服务器时的降级策略
- 要求客户端版本 `10.0.94`，避免旧客户端安装后缺失工具
- 更新内置技能清单、市场统计和版本

## 验证

- `uv run --with httpx --with ruamel-yaml scripts/i18n/validate-i18n.py`
- `uv run --with httpx --with ruamel-yaml scripts/i18n/translate.py
--check`

## Summary

Adds the bilingual `code-intelligence` built-in skill, exposes the
hidden `Lsp` tool only when the skill is active, documents its
permission and fallback behavior, and updates the market manifest and
counts.

builtin-skills.json

@@ -1,5 +1,6 @@
 {
   "skills": [
+    "code-intelligence",
     "configuring-compute",
     "create-agent",
     "dashscope-image-gen",