feat: complete internationalization (i18n) for components

Implemented comprehensive i18n translation support for the following components:

1. GitSettings.jsx - Git configuration interface
2. ApiKeysSettings.jsx - API keys settings
3. CredentialsSettings.jsx - Credentials settings (GitHub tokens)
4. TasksSettings.jsx - TaskMaster task management settings
5. ChatInterface.jsx - Chat interface (major translation work)

New translation files:
- src/i18n/locales/en/chat.json - English chat interface translations
- src/i18n/locales/zh-CN/chat.json - Chinese chat interface translations

ChatInterface.jsx translations:
- Code block copy buttons (Copy, Copied, Copy code)
- Message type labels (User, Error, Tool, Claude, Cursor, Codex)
- Tool settings tooltip
- Search result display (pattern, in, results)
- Codex permission modes (Default, Accept Edits, Bypass Permissions, Plan)
- Input placeholder and hint text
- Keyboard shortcut hints (Ctrl+Enter/Enter modes)
- Command menu button

i18n configuration updates:
- Registered chat namespace in config.js
- Extended settings.json translations (git, apiKeys, tasks, agents, mcpServers sections)

完成以下组件的 i18n 翻译工作：

1. GitSettings.jsx - Git 配置界面
2. ApiKeysSettings.jsx - API 密钥设置
3. CredentialsSettings.jsx - 凭据设置（GitHub Token）
4. TasksSettings.jsx - TaskMaster 任务管理设置
5. ChatInterface.jsx - 聊天界面（主要翻译工作）

新增翻译文件：
- src/i18n/locales/en/chat.json - 英文聊天界面翻译
- src/i18n/locales/zh-CN/chat.json - 中文聊天界面翻译

ChatInterface.jsx 翻译内容：
- 代码块复制按钮
- 消息类型标签
- 工具设置提示
- 搜索结果显示
- Codex 权限模式（默认、编辑、无限制、计划模式）
- 输入框占位符和提示文本
- 键盘快捷键提示
- 命令菜单按钮

更新 i18n 配置：
- 在 config.js 中注册 chat 命名空间
- 扩展 settings.json 翻译（git、apiKeys、tasks、agents、mcpServers 等部分）

src/i18n/locales/en/chat.json

@@ -0,0 +1,111 @@
+{
+  "codeBlock": {
+    "copy": "Copy",
+    "copied": "Copied",
+    "copyCode": "Copy code"
+  },
+  "messageTypes": {
+    "user": "U",
+    "error": "Error",
+    "tool": "Tool",
+    "claude": "Claude",
+    "cursor": "Cursor",
+    "codex": "Codex"
+  },
+  "tools": {
+    "settings": "Tool Settings",
+    "error": "Tool Error",
+    "result": "Tool Result",
+    "viewParams": "View input parameters",
+    "viewRawParams": "View raw parameters",
+    "viewDiff": "View edit diff for",
+    "creatingFile": "Creating new file:",
+    "updatingTodo": "Updating Todo List",
+    "read": "Read",
+    "readFile": "Read file",
+    "updateTodo": "Update todo list",
+    "readTodo": "Read todo list",
+    "searchResults": "results"
+  },
+  "search": {
+    "found": "Found {{count}} {{type}}",
+    "file": "file",
+    "files": "files",
+    "pattern": "pattern:",
+    "in": "in:"
+  },
+  "fileOperations": {
+    "updated": "File updated successfully",
+    "created": "File created successfully",
+    "written": "File written successfully",
+    "diff": "Diff",
+    "newFile": "New File",
+    "viewContent": "View file content",
+    "viewFullOutput": "View full output ({{count}} chars)",
+    "contentDisplayed": "The file content is displayed in the diff view above"
+  },
+  "interactive": {
+    "title": "Interactive Prompt",
+    "waiting": "Waiting for your response in the CLI",
+    "instruction": "Please select an option in your terminal where Claude is running.",
+    "selectedOption": "✓ Claude selected option {{number}}",
+    "instructionDetail": "In the CLI, you would select this option interactively using arrow keys or by typing the number."
+  },
+  "thinking": {
+    "title": "Thinking...",
+    "emoji": "💭 Thinking..."
+  },
+  "json": {
+    "response": "JSON Response"
+  },
+  "permissions": {
+    "grant": "Grant permission for {{tool}}",
+    "added": "Permission added",
+    "addTo": "Adds <span class=\"font-mono\">{{entry}}</span> to Allowed Tools.",
+    "retry": "Permission saved. Retry the request to use the tool.",
+    "error": "Unable to update permissions. Please try again.",
+    "openSettings": "Open settings"
+  },
+  "todo": {
+    "updated": "Todo list has been updated successfully",
+    "current": "Current Todo List"
+  },
+  "plan": {
+    "viewPlan": "📋 View implementation plan",
+    "title": "Implementation Plan"
+  },
+  "usageLimit": {
+    "resetAt": "Claude usage limit reached. Your limit will reset at **{{time}} {{timezone}}** - {{date}}"
+  },
+  "codex": {
+    "permissionMode": "Permission Mode",
+    "modes": {
+      "default": "Default Mode",
+      "acceptEdits": "Accept Edits",
+      "bypassPermissions": "Bypass Permissions",
+      "plan": "Plan Mode"
+    },
+    "descriptions": {
+      "default": "Only trusted commands (ls, cat, grep, git status, etc.) run automatically. Other commands are skipped. Can write to workspace.",
+      "acceptEdits": "All commands run automatically within the workspace. Full auto mode with sandboxed execution.",
+      "bypassPermissions": "Full system access with no restrictions. All commands run automatically with full disk and network access. Use with caution.",
+      "plan": "Planning mode - no commands are executed"
+    },
+    "technicalDetails": "Technical details"
+  },
+  "input": {
+    "placeholder": "Type / for commands, @ for files, or ask {{provider}} anything...",
+    "placeholderDefault": "Type your message...",
+    "disabled": "Input disabled",
+    "attachFiles": "Attach files",
+    "attachImages": "Attach images",
+    "send": "Send",
+    "stop": "Stop",
+    "hintText": {
+      "ctrlEnter": "Ctrl+Enter to send • Shift+Enter for new line • Tab to change modes • / for slash commands",
+      "enter": "Enter to send • Shift+Enter for new line • Tab to change modes • / for slash commands"
+    },
+    "clickToChangeMode": "Click to change permission mode (or press Tab in input)",
+    "showAllCommands": "Show all commands"
+  }
+}