feat: add CodexLens v2 management features including model management, index operations, env config, and MCP config

- Implemented CodexLens routes for model listing, downloading, and deleting.
- Added hooks for managing CodexLens models, index status, environment variables, and MCP configuration.
- Created frontend components for managing environment settings, index status, and models.
- Developed the main CodexLens page with tab navigation for easy access to different management features.
- Introduced a new file structure for CodexLens related components and hooks.

ccw/frontend/src/locales/en/codexlens.json

@@ -1,6 +1,70 @@
 {
   "title": "Search Manager",
   "description": "V2 semantic search index management",
+  "page": {
+    "title": "CodexLens v2",
+    "description": "Semantic code search engine — manage MCP config, embedding models, index state, and environment settings."
+  },
+  "tabs": {
+    "mcp": "MCP Config",
+    "models": "Model Manager",
+    "index": "Index Manager",
+    "env": "Env Settings"
+  },
+  "mcp": {
+    "embedMode": "Embed mode",
+    "configTitle": "MCP Config JSON",
+    "copy": "Copy",
+    "copied": "Copied",
+    "regenerate": "Regenerate Config",
+    "loading": "Loading config...",
+    "error": "Failed to load MCP config.",
+    "noConfig": "No config available.",
+    "installTitle": "Installation Instructions",
+    "installSteps": {
+      "step1": "Copy the MCP config JSON above using the Copy button.",
+      "step2": "Open your Claude Desktop or MCP-compatible client configuration file.",
+      "step3": "Add the copied JSON under the mcpServers key.",
+      "step4": "Save the configuration file and restart your client.",
+      "step5": "Verify the CodexLens server appears as an available MCP tool."
+    }
+  },
+  "models": {
+    "embedMode": "Current embed mode",
+    "loading": "Loading models...",
+    "error": "Failed to load models.",
+    "noModels": "No models found.",
+    "installed": "Installed",
+    "notInstalled": "Not installed",
+    "download": "Download",
+    "delete": "Delete"
+  },
+  "index": {
+    "pathPlaceholder": "Enter project path (e.g. /home/user/myproject)",
+    "add": "Add",
+    "loading": "Loading status...",
+    "error": "Failed to load index status.",
+    "filesTracked": "Files tracked",
+    "totalChunks": "Total chunks",
+    "deletedChunks": "Deleted chunks",
+    "sync": "Sync",
+    "rebuild": "Rebuild",
+    "refresh": "Refresh Status",
+    "empty": "Enter a project path above to view index status and manage indexing.",
+    "removeProject": "Remove project"
+  },
+  "env": {
+    "loading": "Loading environment settings...",
+    "save": "Save",
+    "saving": "Saving...",
+    "clearForm": "Clear Form",
+    "sections": {
+      "embed": "Embed Config",
+      "reranker": "Reranker Config",
+      "performance": "Performance Tuning",
+      "index": "Index Params"
+    }
+  },
   "reindex": "Reindex",
   "reindexing": "Reindexing...",
   "statusError": "Failed to load search index status",

ccw/frontend/src/locales/en/mcp-manager.json

@@ -426,10 +426,10 @@
   },
   "exa": {
     "name": "Exa Search",
-    "desc": "AI-powered web search with real-time crawling capabilities",
+    "desc": "AI-powered web search via remote MCP server (mcp.exa.ai)",
     "field": {
       "apiKey": "API Key",
-      "apiKey.desc": "Your Exa API key (optional, some features may require it)"
+      "apiKey.desc": "Your Exa API key (optional, adds to URL to overcome free plan rate limits)"
     }
   },
   "enterprise": {

ccw/frontend/src/locales/zh/codexlens.json

@@ -4,6 +4,70 @@
   "reindex": "重建索引",
   "reindexing": "重建中...",
   "statusError": "加载搜索索引状态失败",
+  "page": {
+    "title": "CodexLens v2",
+    "description": "语义代码搜索引擎 — 管理 MCP 配置、嵌入模型、索引状态和环境变量"
+  },
+  "tabs": {
+    "mcp": "MCP 配置",
+    "models": "模型管理",
+    "index": "索引管理",
+    "env": "环境变量"
+  },
+  "mcp": {
+    "embedMode": "嵌入模式",
+    "configTitle": "MCP 配置 JSON",
+    "copy": "复制",
+    "copied": "已复制",
+    "regenerate": "重新生成配置",
+    "loading": "加载配置中...",
+    "error": "加载 MCP 配置失败",
+    "noConfig": "暂无配置",
+    "installTitle": "安装说明",
+    "installSteps": {
+      "step1": "点击复制按钮复制 MCP 配置 JSON。",
+      "step2": "打开 Claude Desktop 或兼容 MCP 的客户端配置文件。",
+      "step3": "将复制的 JSON 添加到 mcpServers 键下。",
+      "step4": "保存配置文件并重启客户端。",
+      "step5": "验证 CodexLens 服务器是否作为可用 MCP 工具出现。"
+    }
+  },
+  "models": {
+    "embedMode": "当前嵌入模式",
+    "loading": "加载模型中...",
+    "error": "加载模型失败",
+    "noModels": "未找到模型",
+    "installed": "已安装",
+    "notInstalled": "未安装",
+    "download": "下载",
+    "delete": "删除"
+  },
+  "index": {
+    "pathPlaceholder": "输入项目路径（例如 /home/user/myproject）",
+    "add": "添加",
+    "loading": "加载状态中...",
+    "error": "加载索引状态失败",
+    "filesTracked": "跟踪文件数",
+    "totalChunks": "总分块数",
+    "deletedChunks": "已删除分块",
+    "sync": "同步",
+    "rebuild": "重建",
+    "refresh": "刷新状态",
+    "empty": "在上方输入项目路径以查看索引状态和管理索引",
+    "removeProject": "移除项目"
+  },
+  "env": {
+    "loading": "加载环境设置中...",
+    "save": "保存",
+    "saving": "保存中...",
+    "clearForm": "清空表单",
+    "sections": {
+      "embed": "嵌入配置",
+      "reranker": "重排序配置",
+      "performance": "性能调优",
+      "index": "索引参数"
+    }
+  },
   "indexStatus": {
     "title": "索引状态",
     "status": "状态",

ccw/frontend/src/locales/zh/mcp-manager.json

@@ -415,10 +415,10 @@
   },
   "exa": {
     "name": "Exa 搜索",
-    "desc": "AI 驱动的网络搜索，支持实时抓取",
+    "desc": "通过远程 MCP 服务器 (mcp.exa.ai) 实现 AI 驱动的网络搜索",
     "field": {
       "apiKey": "API 密钥",
-      "apiKey.desc": "您的 Exa API 密钥（可选，部分功能可能需要）"
+      "apiKey.desc": "您的 Exa API 密钥（可选，填入后将作为 URL 参数传递以突破免费计划限速）"
     }
   },
   "enterprise": {