feat(proxy): add full URL mode and refactor endpoint rewriting (#1561)

* feat(proxy): add full URL mode and refactor endpoint rewriting

- Add `isFullUrl` provider meta to treat base_url as complete API endpoint
- Remove hardcoded `?beta=true` from Claude adapter, pass through from client
- Refactor forwarder endpoint rewriting with proper query string handling
- Block provider switching when proxy is required but not running
- Add full URL toggle UI in endpoint field with i18n (zh/en/ja)

* refactor(proxy): remove beta query handling

* fix(proxy): strip beta query when rewriting Claude endpoints

* feat(codex): complete full URL support

* refactor(ui): refine full URL endpoint hint

src/components/providers/forms/CodexFormFields.tsx

@@ -22,6 +22,8 @@ interface CodexFormFieldsProps {
   shouldShowSpeedTest: boolean;
   codexBaseUrl: string;
   onBaseUrlChange: (url: string) => void;
+  isFullUrl: boolean;
+  onFullUrlChange: (value: boolean) => void;
   isEndpointModalOpen: boolean;
   onEndpointModalToggle: (open: boolean) => void;
   onCustomEndpointsChange?: (endpoints: string[]) => void;
@@ -49,6 +51,8 @@ export function CodexFormFields({
   shouldShowSpeedTest,
   codexBaseUrl,
   onBaseUrlChange,
+  isFullUrl,
+  onFullUrlChange,
   isEndpointModalOpen,
   onEndpointModalToggle,
   onCustomEndpointsChange,
@@ -93,6 +97,9 @@ export function CodexFormFields({
           onChange={onBaseUrlChange}
           placeholder={t("providerForm.codexApiEndpointPlaceholder")}
           hint={t("providerForm.codexApiHint")}
+          showFullUrlToggle
+          isFullUrl={isFullUrl}
+          onFullUrlChange={onFullUrlChange}
           onManageClick={() => onEndpointModalToggle(true)}
         />
       )}