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/ProviderForm.tsx

@@ -162,6 +162,11 @@ export function ProviderForm({
   const [endpointAutoSelect, setEndpointAutoSelect] = useState<boolean>(
     () => initialData?.meta?.endpointAutoSelect ?? true,
   );
+  const supportsFullUrl = appId === "claude" || appId === "codex";
+  const [localIsFullUrl, setLocalIsFullUrl] = useState<boolean>(() => {
+    if (!supportsFullUrl) return false;
+    return initialData?.meta?.isFullUrl ?? false;
+  });
 
   const [testConfig, setTestConfig] = useState<ProviderTestConfig>(
     () => initialData?.meta?.testConfig ?? { enabled: false },
@@ -201,6 +206,9 @@ export function ProviderForm({
       setDraftCustomEndpoints([]);
     }
     setEndpointAutoSelect(initialData?.meta?.endpointAutoSelect ?? true);
+    setLocalIsFullUrl(
+      supportsFullUrl ? (initialData?.meta?.isFullUrl ?? false) : false,
+    );
     setTestConfig(initialData?.meta?.testConfig ?? { enabled: false });
     setProxyConfig(initialData?.meta?.proxyConfig ?? { enabled: false });
     setPricingConfig({
@@ -212,7 +220,7 @@ export function ProviderForm({
         initialData?.meta?.pricingModelSource,
       ),
     });
-  }, [appId, initialData]);
+  }, [appId, initialData, supportsFullUrl]);
 
   const defaultValues: ProviderFormData = useMemo(
     () => ({
@@ -941,6 +949,10 @@ export function ProviderForm({
         localApiKeyField !== "ANTHROPIC_AUTH_TOKEN"
           ? localApiKeyField
           : undefined,
+      isFullUrl:
+        supportsFullUrl && category !== "official" && localIsFullUrl
+          ? true
+          : undefined,
     };
 
     await onSubmit(payload);
@@ -1180,6 +1192,7 @@ export function ProviderForm({
     }
 
     setLocalApiKeyField(preset.apiKeyField ?? "ANTHROPIC_AUTH_TOKEN");
+    setLocalIsFullUrl(false);
 
     form.reset({
       name: preset.nameKey ? t(preset.nameKey) : preset.name,
@@ -1402,6 +1415,8 @@ export function ProviderForm({
             onApiFormatChange={handleApiFormatChange}
             apiKeyField={localApiKeyField}
             onApiKeyFieldChange={handleApiKeyFieldChange}
+            isFullUrl={localIsFullUrl}
+            onFullUrlChange={setLocalIsFullUrl}
           />
         )}
 
@@ -1418,6 +1433,8 @@ export function ProviderForm({
             shouldShowSpeedTest={shouldShowSpeedTest}
             codexBaseUrl={codexBaseUrl}
             onBaseUrlChange={handleCodexBaseUrlChange}
+            isFullUrl={localIsFullUrl}
+            onFullUrlChange={setLocalIsFullUrl}
             isEndpointModalOpen={isCodexEndpointModalOpen}
             onEndpointModalToggle={setIsCodexEndpointModalOpen}
             onCustomEndpointsChange={