feat: 添加尾盘策略配置指南文档和前端链接

- 新增中文和英文配置指南文档（docs/zh|en/crypto-tail-strategy-user-guide.md）
- 在尾盘策略列表页面添加配置指南链接按钮
- 根据用户语言自动跳转到对应语言的 GitHub 文档预览
- 添加多语言翻译键（中文简体/繁体/英文）

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/locales/en/common.json

@@ -1428,7 +1428,8 @@
       "delete": "Delete",
       "viewTriggers": "Orders",
       "deleteConfirm": "Delete this strategy?",
-      "fetchFailed": "Failed to fetch list"
+      "fetchFailed": "Failed to fetch list",
+      "configGuide": "Configuration Guide"
     },
     "form": {
       "walletTip": "Use a dedicated wallet to avoid balance or order issues.",

frontend/src/locales/zh-CN/common.json

@@ -1427,7 +1427,8 @@
       "delete": "删除",
       "viewTriggers": "订单",
       "deleteConfirm": "确定删除该策略？",
-      "fetchFailed": "获取列表失败"
+      "fetchFailed": "获取列表失败",
+      "configGuide": "配置指南"
     },
     "form": {
       "walletTip": "建议使用专用钱包，避免手动操作等导致余额或下单异常。",

frontend/src/locales/zh-TW/common.json

@@ -1428,7 +1428,8 @@
       "delete": "刪除",
       "viewTriggers": "訂單",
       "deleteConfirm": "確定刪除該策略？",
-      "fetchFailed": "獲取列表失敗"
+      "fetchFailed": "獲取列表失敗",
+      "configGuide": "配置指南"
     },
     "form": {
       "walletTip": "建議使用專用錢包，避免手動操作等導致餘額或下單異常。",