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.

manifest.json

@@ -1,6 +1,6 @@
 {
   "name": "DesireCore Official Market",
-  "version": "1.2.15",
+  "version": "1.2.16",
   "schemaVersion": "1.1.0",
   "supportedLocales": ["zh-CN", "en-US"],
   "defaultLocale": "en-US",
@@ -27,8 +27,8 @@
   },
   "stats": {
     "totalAgents": 1,
-    "totalSkills": 52,
-    "lastUpdated": "2026-07-19"
+    "totalSkills": 53,
+    "lastUpdated": "2026-07-22"
   },
   "features": [
     "curated-index",