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)

src/components/providers/forms/ClaudeFormFields.tsx

@@ -76,6 +76,10 @@ interface ClaudeFormFieldsProps {
   // Auth Field (ANTHROPIC_AUTH_TOKEN or ANTHROPIC_API_KEY)
   apiKeyField: ClaudeApiKeyField;
   onApiKeyFieldChange: (field: ClaudeApiKeyField) => void;
+
+  // Full URL mode
+  isFullUrl: boolean;
+  onFullUrlChange: (value: boolean) => void;
 }
 
 export function ClaudeFormFields({
@@ -112,6 +116,8 @@ export function ClaudeFormFields({
   onApiFormatChange,
   apiKeyField,
   onApiKeyFieldChange,
+  isFullUrl,
+  onFullUrlChange,
 }: ClaudeFormFieldsProps) {
   const { t } = useTranslation();
 
@@ -181,6 +187,9 @@ export function ClaudeFormFields({
                 : t("providerForm.apiHint")
           }
           onManageClick={() => onEndpointModalToggle(true)}
+          showFullUrlToggle={true}
+          isFullUrl={isFullUrl}
+          onFullUrlChange={onFullUrlChange}
         />
       )}
 

src/components/providers/forms/ProviderForm.tsx

@@ -160,6 +160,10 @@ export function ProviderForm({
   const [endpointAutoSelect, setEndpointAutoSelect] = useState<boolean>(
     () => initialData?.meta?.endpointAutoSelect ?? true,
   );
+  const [localIsFullUrl, setLocalIsFullUrl] = useState<boolean>(() => {
+    if (appId !== "claude") return false;
+    return initialData?.meta?.isFullUrl ?? false;
+  });
 
   const [testConfig, setTestConfig] = useState<ProviderTestConfig>(
     () => initialData?.meta?.testConfig ?? { enabled: false },
@@ -199,6 +203,9 @@ export function ProviderForm({
       setDraftCustomEndpoints([]);
     }
     setEndpointAutoSelect(initialData?.meta?.endpointAutoSelect ?? true);
+    setLocalIsFullUrl(
+      appId === "claude" ? (initialData?.meta?.isFullUrl ?? false) : false,
+    );
     setTestConfig(initialData?.meta?.testConfig ?? { enabled: false });
     setProxyConfig(initialData?.meta?.proxyConfig ?? { enabled: false });
     setPricingConfig({
@@ -897,6 +904,10 @@ export function ProviderForm({
         localApiKeyField !== "ANTHROPIC_AUTH_TOKEN"
           ? localApiKeyField
           : undefined,
+      isFullUrl:
+        appId === "claude" && category !== "official" && localIsFullUrl
+          ? true
+          : undefined,
     };
 
     await onSubmit(payload);
@@ -1136,6 +1147,7 @@ export function ProviderForm({
     }
 
     setLocalApiKeyField(preset.apiKeyField ?? "ANTHROPIC_AUTH_TOKEN");
+    setLocalIsFullUrl(false);
 
     form.reset({
       name: preset.nameKey ? t(preset.nameKey) : preset.name,
@@ -1344,6 +1356,8 @@ export function ProviderForm({
             onApiFormatChange={handleApiFormatChange}
             apiKeyField={localApiKeyField}
             onApiKeyFieldChange={handleApiKeyFieldChange}
+            isFullUrl={localIsFullUrl}
+            onFullUrlChange={setLocalIsFullUrl}
           />
         )}
 
@@ -1607,7 +1621,9 @@ export function ProviderForm({
             <Button variant="outline" type="button" onClick={onCancel}>
               {t("common.cancel")}
             </Button>
-            <Button type="submit" disabled={isSubmitting}>{submitLabel}</Button>
+            <Button type="submit" disabled={isSubmitting}>
+              {submitLabel}
+            </Button>
           </div>
         )}
       </form>

src/components/providers/forms/shared/EndpointField.tsx

@@ -1,7 +1,7 @@
 import { useTranslation } from "react-i18next";
 import { FormLabel } from "@/components/ui/form";
 import { Input } from "@/components/ui/input";
-import { Zap } from "lucide-react";
+import { Link2, Zap } from "lucide-react";
 
 interface EndpointFieldProps {
   id: string;
@@ -13,6 +13,9 @@ interface EndpointFieldProps {
   showManageButton?: boolean;
   onManageClick?: () => void;
   manageButtonLabel?: string;
+  showFullUrlToggle?: boolean;
+  isFullUrl?: boolean;
+  onFullUrlChange?: (value: boolean) => void;
 }
 
 export function EndpointField({
@@ -25,6 +28,9 @@ export function EndpointField({
   showManageButton = true,
   onManageClick,
   manageButtonLabel,
+  showFullUrlToggle = false,
+  isFullUrl = false,
+  onFullUrlChange,
 }: EndpointFieldProps) {
   const { t } = useTranslation();
 
@@ -55,6 +61,35 @@ export function EndpointField({
         placeholder={placeholder}
         autoComplete="off"
       />
+      {showFullUrlToggle && onFullUrlChange ? (
+        <div className="flex items-center gap-2">
+          <button
+            type="button"
+            onClick={() => onFullUrlChange(!isFullUrl)}
+            className={`flex items-center gap-1.5 rounded-md border px-2.5 py-1 text-xs transition-colors ${
+              isFullUrl
+                ? "border-primary bg-primary/10 text-primary"
+                : "border-border text-muted-foreground hover:border-foreground/30 hover:text-foreground"
+            }`}
+          >
+            <Link2 className="h-3.5 w-3.5" />
+            {isFullUrl
+              ? t("providerForm.fullUrlEnabled", {
+                  defaultValue: "完整 URL 模式",
+                })
+              : t("providerForm.fullUrlDisabled", {
+                  defaultValue: "标记为完整 URL",
+                })}
+          </button>
+          {isFullUrl ? (
+            <span className="text-xs text-muted-foreground">
+              {t("providerForm.fullUrlHint", {
+                defaultValue: "代理将直接使用此 URL，不拼接路径",
+              })}
+            </span>
+          ) : null}
+        </div>
+      ) : null}
       {hint ? (
         <div className="p-3 bg-amber-50 dark:bg-amber-900/20 border border-amber-200 dark:border-amber-700 rounded-lg">
           <p className="text-xs text-amber-600 dark:text-amber-400">{hint}</p>