feat(ui): add OpenRouter compatibility mode toggle

Add UI toggle for OpenRouter providers to enable/disable compatibility
mode which uses OpenAI Chat Completions format with SSE conversion.

src/components/providers/forms/ClaudeFormFields.tsx

@@ -1,5 +1,6 @@
 import { useTranslation } from "react-i18next";
 import { FormLabel } from "@/components/ui/form";
+import { Switch } from "@/components/ui/switch";
 import { Input } from "@/components/ui/input";
 import EndpointSpeedTest from "./EndpointSpeedTest";
 import { ApiKeySection, EndpointField } from "./shared";
@@ -55,6 +56,11 @@ interface ClaudeFormFieldsProps {
 
   // Speed Test Endpoints
   speedTestEndpoints: EndpointCandidate[];
+
+  // OpenRouter Compat
+  showOpenRouterCompatToggle: boolean;
+  openRouterCompatEnabled: boolean;
+  onOpenRouterCompatChange: (enabled: boolean) => void;
 }
 
 export function ClaudeFormFields({
@@ -85,6 +91,9 @@ export function ClaudeFormFields({
   defaultOpusModel,
   onModelChange,
   speedTestEndpoints,
+  showOpenRouterCompatToggle,
+  openRouterCompatEnabled,
+  onOpenRouterCompatChange,
 }: ClaudeFormFieldsProps) {
   const { t } = useTranslation();
 
@@ -165,6 +174,28 @@ export function ClaudeFormFields({
         />
       )}
 
+      {showOpenRouterCompatToggle && (
+        <div className="flex items-center justify-between rounded-lg border border-white/10 bg-background/60 p-4">
+          <div className="space-y-1">
+            <FormLabel>
+              {t("providerForm.openrouterCompatMode", {
+                defaultValue: "OpenRouter 兼容模式",
+              })}
+            </FormLabel>
+            <p className="text-xs text-muted-foreground">
+              {t("providerForm.openrouterCompatModeHint", {
+                defaultValue:
+                  "使用 OpenAI Chat Completions 接口并转换为 Anthropic SSE。",
+              })}
+            </p>
+          </div>
+          <Switch
+            checked={openRouterCompatEnabled}
+            onCheckedChange={onOpenRouterCompatChange}
+          />
+        </div>
+      )}
+
       {/* 模型选择器 */}
       {shouldShowModelSelector && (
         <div className="space-y-3">

src/components/providers/forms/ProviderForm.tsx

@@ -162,6 +162,8 @@ export function ProviderForm({
     mode: "onSubmit",
   });
 
+  const settingsConfigValue = form.watch("settingsConfig");
+
   // 使用 API Key hook
   const {
     apiKey,
@@ -200,6 +202,53 @@ export function ProviderForm({
     onConfigChange: (config) => form.setValue("settingsConfig", config),
   });
 
+  const isOpenRouterProvider = useMemo(() => {
+    if (appId !== "claude") return false;
+    const normalized = baseUrl.trim().toLowerCase();
+    if (normalized.includes("openrouter.ai")) {
+      return true;
+    }
+    try {
+      const config = JSON.parse(settingsConfigValue || "{}");
+      const envUrl = config?.env?.ANTHROPIC_BASE_URL;
+      return typeof envUrl === "string" && envUrl.includes("openrouter.ai");
+    } catch {
+      return false;
+    }
+  }, [appId, baseUrl, settingsConfigValue]);
+
+  const openRouterCompatEnabled = useMemo(() => {
+    if (!isOpenRouterProvider) return false;
+    try {
+      const config = JSON.parse(settingsConfigValue || "{}");
+      const raw = config?.openrouter_compat_mode;
+      if (typeof raw === "boolean") return raw;
+      if (typeof raw === "number") return raw !== 0;
+      if (typeof raw === "string") {
+        const normalized = raw.trim().toLowerCase();
+        return normalized === "true" || normalized === "1";
+      }
+    } catch {
+      // ignore
+    }
+    return true;
+  }, [isOpenRouterProvider, settingsConfigValue]);
+
+  const handleOpenRouterCompatChange = useCallback(
+    (enabled: boolean) => {
+      try {
+        const currentConfig = JSON.parse(
+          form.getValues("settingsConfig") || "{}",
+        );
+        currentConfig.openrouter_compat_mode = enabled;
+        form.setValue("settingsConfig", JSON.stringify(currentConfig, null, 2));
+      } catch {
+        // ignore
+      }
+    },
+    [form],
+  );
+
   // 使用 Codex 配置 hook (仅 Codex 模式)
   const {
     codexAuth,
@@ -796,6 +845,9 @@ export function ProviderForm({
             defaultOpusModel={defaultOpusModel}
             onModelChange={handleModelChange}
             speedTestEndpoints={speedTestEndpoints}
+            showOpenRouterCompatToggle={isOpenRouterProvider}
+            openRouterCompatEnabled={openRouterCompatEnabled}
+            onOpenRouterCompatChange={handleOpenRouterCompatChange}
           />
         )}