feat(login): add phone and Google login page with i18n

Add complete login flow with phone verification and country picker.
Add login-related translations for en-US, zh-CN and th-TH locales.
Add country calling codes constants and selection utility function.
Register Vant UI component type definitions for TypeScript.
Update development environment authentication token.

src/i18n/modules/common/zh-CN.ts

@@ -7,6 +7,34 @@ export default {
   errors: {
     network: "网络异常，请稍后重试",
   },
+  login: {
+    method: {
+      google: "谷歌账号登录",
+      phone: "手机号验证码登录",
+    },
+    fields: {
+      country: "国家/区号",
+      phone: "手机号",
+      code: "验证码",
+    },
+    placeholders: {
+      selectCountry: "请选择国家/区号",
+      phone: "请输入手机号",
+      code: "请输入验证码",
+    },
+    dividersText: "或",
+    actions: {
+      sendCode: "获取验证码",
+      login: "登录",
+    },
+    errors: {
+      missingPhone: "请输入手机号",
+      missingCode: "请输入验证码",
+    },
+    tips: {
+      smsApiMissing: "验证码发送接口未接入",
+    },
+  },
   state: {
     empty: "暂无数据",
     loading: "加载中...",