fix: sync Gemini form fields with env editor

The Gemini API key, base URL, and model inputs were not syncing with
the env editor below due to data source mismatch. The form was using
generic hooks (useApiKeyState, useBaseUrlState) that only updated
settingsConfig, while the env editor relied on geminiEnv from
useGeminiConfigState.

Changes:
- Use geminiApiKey/geminiBaseUrl from useGeminiConfigState instead of
  generic hooks
- Wrap handlers to maintain bidirectional sync between geminiEnv and
  settingsConfig
- Remove unused handleGeminiBaseUrlChange from useBaseUrlState to
  avoid naming conflicts

Now all Gemini form fields properly sync with the env editor in both
directions.

src/components/providers/forms/ProviderForm.tsx

@@ -171,18 +171,16 @@ export function ProviderForm({
   });
 
   // 使用 Base URL hook (Claude, Codex, Gemini)
-  const { baseUrl, handleClaudeBaseUrlChange, handleGeminiBaseUrlChange } =
-    useBaseUrlState({
-      appType: appId,
-      category,
-      settingsConfig: form.watch("settingsConfig"),
-      codexConfig: "",
-      onSettingsConfigChange: (config) =>
-        form.setValue("settingsConfig", config),
-      onCodexConfigChange: () => {
-        /* noop */
-      },
-    });
+  const { baseUrl, handleClaudeBaseUrlChange } = useBaseUrlState({
+    appType: appId,
+    category,
+    settingsConfig: form.watch("settingsConfig"),
+    codexConfig: "",
+    onSettingsConfigChange: (config) => form.setValue("settingsConfig", config),
+    onCodexConfigChange: () => {
+      /* noop */
+    },
+  });
 
   // 使用 Model hook（新：主模型 + Haiku/Sonnet/Opus 默认模型）
   const {
@@ -317,9 +315,13 @@ export function ProviderForm({
   const {
     geminiEnv,
     geminiConfig,
+    geminiApiKey,
+    geminiBaseUrl,
     geminiModel,
     envError,
     configError: geminiConfigError,
+    handleGeminiApiKeyChange: originalHandleGeminiApiKeyChange,
+    handleGeminiBaseUrlChange: originalHandleGeminiBaseUrlChange,
     handleGeminiEnvChange,
     handleGeminiConfigChange,
     resetGeminiConfig,
@@ -329,6 +331,39 @@ export function ProviderForm({
     initialData: appId === "gemini" ? initialData : undefined,
   });
 
+  // 包装 Gemini handlers 以同步 settingsConfig
+  const handleGeminiApiKeyChange = useCallback(
+    (key: string) => {
+      originalHandleGeminiApiKeyChange(key);
+      // 同步更新 settingsConfig
+      try {
+        const config = JSON.parse(form.watch("settingsConfig") || "{}");
+        if (!config.env) config.env = {};
+        config.env.GEMINI_API_KEY = key.trim();
+        form.setValue("settingsConfig", JSON.stringify(config, null, 2));
+      } catch {
+        // ignore
+      }
+    },
+    [originalHandleGeminiApiKeyChange, form],
+  );
+
+  const handleGeminiBaseUrlChange = useCallback(
+    (url: string) => {
+      originalHandleGeminiBaseUrlChange(url);
+      // 同步更新 settingsConfig
+      try {
+        const config = JSON.parse(form.watch("settingsConfig") || "{}");
+        if (!config.env) config.env = {};
+        config.env.GOOGLE_GEMINI_BASE_URL = url.trim().replace(/\/+$/, "");
+        form.setValue("settingsConfig", JSON.stringify(config, null, 2));
+      } catch {
+        // ignore
+      }
+    },
+    [originalHandleGeminiBaseUrlChange, form],
+  );
+
   // 使用 Gemini 通用配置 hook (仅 Gemini 模式)
   const {
     useCommonConfig: useGeminiCommonConfigFlag,
@@ -704,15 +739,15 @@ export function ProviderForm({
               form.watch("settingsConfig"),
               isEditMode,
             )}
-            apiKey={apiKey}
-            onApiKeyChange={handleApiKeyChange}
+            apiKey={geminiApiKey}
+            onApiKeyChange={handleGeminiApiKeyChange}
             category={category}
             shouldShowApiKeyLink={shouldShowGeminiApiKeyLink}
             websiteUrl={geminiWebsiteUrl}
             isPartner={isGeminiPartner}
             partnerPromotionKey={geminiPartnerPromotionKey}
             shouldShowSpeedTest={shouldShowSpeedTest}
-            baseUrl={baseUrl}
+            baseUrl={geminiBaseUrl}
             onBaseUrlChange={handleGeminiBaseUrlChange}
             isEndpointModalOpen={isEndpointModalOpen}
             onEndpointModalToggle={setIsEndpointModalOpen}