feat: 添加 CLOB 2.0 迁移弹窗提醒与账户页迁移引导

登录后首次进入显示迁移提醒弹窗，引导用户前往账户页；
账户页首次进入时显示 Alert 提示 USDC.e → pUSD 迁移按钮；
移动端账户卡片补充 swap 操作按钮。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/locales/en/common.json

@@ -1801,5 +1801,14 @@
       "maxSizeUpdated": "Updated to max size",
       "periodChanged": "Period has changed, popup closed"
     }
+  },
+  "clobMigration": {
+    "title": "CLOB 2.0 Migration Notice",
+    "description": "Polymarket CLOB has been upgraded to V2. Please go to the Accounts page to complete the USDC migration to ensure trading functions properly.",
+    "goToAccounts": "Go to Accounts",
+    "dontRemind": "Don't remind again",
+    "accountGuide": "CLOB V2 requires pUSD for trading. Click the USDC.e → pUSD button in the account actions to complete the migration.",
+    "accountGuideButton": "USDC.e → pUSD",
+    "dismissGuide": "Got it"
   }
 }