feat: enhance Claude request header handling with append functionality

web/src/i18n/locales/zh-TW.json

@@ -69,6 +69,8 @@
     "Claude思考适配 BudgetTokens = MaxTokens * BudgetTokens 百分比": "Claude思考相容 BudgetTokens = MaxTokens * BudgetTokens 百分比",
     "Claude设置": "Claude設定",
     "Claude请求头覆盖": "Claude請求頭覆蓋",
+    "Claude请求头追加": "Claude請求頭追加",
+    "Claude会在原有请求头基础上追加这些值，不会覆盖已有同名请求头；重复值会自动忽略。": "Claude會在原有請求頭基礎上追加這些值，不會覆蓋已有同名請求頭；重複值會自動忽略。",
     "Client ID": "Client ID",
     "Client Secret": "Client Secret",
     "common.changeLanguage": "common.changeLanguage",
@@ -1419,6 +1421,9 @@
     "格式化": "格式化",
     "格式正确": "格式正確",
     "格式示例：": "格式示例：",
+    "前：": "前：",
+    "配置：": "配置：",
+    "后：": "後：",
     "格式错误": "格式錯誤",
     "检查更新": "檢查更新",
     "检测到 FluentRead（流畅阅读）": "檢測到 FluentRead（流暢閱讀）",