fix(cli): localize plugin/help command strings via i18n (closes #118) (#134)

Wire plugin module + help command + OAuth client-id/secret flags through
the existing i18n catalog so --help is consistent Chinese under zh locale
and English under en locale, instead of mixing the two.

- internal/app/plugin_cmd.go: wrap 16 Short strings with i18n.T
- internal/app/flags.go: wrap --client-id/--client-secret descriptions
- internal/app/root_help.go: override cobra default help command with a
  localized one so "dws help --help" and the utility-commands listing
  share the same catalog
- internal/i18n/locales/{en,zh}.json: add 20 new catalog entries

Verified under DWS_LANG=zh (all Chinese), DWS_LANG=en (original English
preserved), and LANG-based auto-routing. go test ./internal/app/... pass.

Co-authored-by: 修雨 <huyizhou.hyz@alibaba-inc.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

internal/i18n/locales/en.json

@@ -170,5 +170,25 @@
   "等待提交申请中": "Waiting to submit request",
   "操作超时，请重新登录": "Operation timed out, please re-login",
   "检查组织 CLI 授权状态...": "Checking organization CLI auth status...",
-  "🔐 登录钉钉": "🔐 Login to DingTalk"
+  "🔐 登录钉钉": "🔐 Login to DingTalk",
+  "插件管理": "Manage plugins",
+  "列出已安装的插件": "List installed plugins",
+  "安装插件": "Install a plugin",
+  "查看插件详情": "Show plugin details",
+  "启用插件": "Enable a plugin",
+  "禁用插件": "Disable a plugin",
+  "卸载已安装的插件": "Remove an installed plugin",
+  "校验 plugin.json": "Validate a plugin.json",
+  "脚手架生成新插件目录": "Scaffold a new plugin directory",
+  "将本地目录注册为开发态插件": "Register a local directory as a dev plugin",
+  "管理插件配置": "Manage plugin configuration",
+  "设置插件配置项": "Set a plugin config value",
+  "读取插件配置项": "Get a plugin config value",
+  "列出插件所有配置项": "List all config values for a plugin",
+  "删除插件配置项": "Remove a plugin config value",
+  "将插件 stdio server 编译为原生二进制": "Build plugin's stdio server into a native binary",
+  "覆盖 OAuth 客户端 ID (钉钉 AppKey)": "Override OAuth client ID (DingTalk AppKey)",
+  "覆盖 OAuth 客户端密钥 (钉钉 AppSecret)": "Override OAuth client secret (DingTalk AppSecret)",
+  "查看任意命令的帮助信息": "Help about any command",
+  "显示任意命令的帮助文案。\n用法：dws help [命令路径] 查看完整说明。": "Help provides help for any command in the application.\nSimply type dws help [path to command] for full details."
 }

internal/i18n/locales/zh.json

@@ -170,5 +170,25 @@
   "等待提交申请中": "等待提交申请中",
   "操作超时，请重新登录": "操作超时，请重新登录",
   "检查组织 CLI 授权状态...": "检查组织 CLI 授权状态...",
-  "🔐 登录钉钉": "🔐 登录钉钉"
+  "🔐 登录钉钉": "🔐 登录钉钉",
+  "插件管理": "插件管理",
+  "列出已安装的插件": "列出已安装的插件",
+  "安装插件": "安装插件",
+  "查看插件详情": "查看插件详情",
+  "启用插件": "启用插件",
+  "禁用插件": "禁用插件",
+  "卸载已安装的插件": "卸载已安装的插件",
+  "校验 plugin.json": "校验 plugin.json",
+  "脚手架生成新插件目录": "脚手架生成新插件目录",
+  "将本地目录注册为开发态插件": "将本地目录注册为开发态插件",
+  "管理插件配置": "管理插件配置",
+  "设置插件配置项": "设置插件配置项",
+  "读取插件配置项": "读取插件配置项",
+  "列出插件所有配置项": "列出插件所有配置项",
+  "删除插件配置项": "删除插件配置项",
+  "将插件 stdio server 编译为原生二进制": "将插件 stdio server 编译为原生二进制",
+  "覆盖 OAuth 客户端 ID (钉钉 AppKey)": "覆盖 OAuth 客户端 ID (钉钉 AppKey)",
+  "覆盖 OAuth 客户端密钥 (钉钉 AppSecret)": "覆盖 OAuth 客户端密钥 (钉钉 AppSecret)",
+  "查看任意命令的帮助信息": "查看任意命令的帮助信息",
+  "显示任意命令的帮助文案。\n用法：dws help [命令路径] 查看完整说明。": "显示任意命令的帮助文案。\n用法：dws help [命令路径] 查看完整说明。"
 }