Update authentication redirects to use environment variable for site URL, enhancing flexibility for different environments. Add NEXT_PUBLIC_SITE_URL to .env for production URL configuration.

lib/auth.tsx

@@ -101,11 +101,14 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
   const signInWithGoogle = async () => {
     setIsLoading(true);
     try {
+      // 获取网站 URL，如果环境变量不存在则使用当前来源
+      const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || window.location.origin;
+      
       // 尝试通过Supabase登录Google
       const { error } = await supabase.auth.signInWithOAuth({
         provider: 'google',
         options: {
-          redirectTo: `${window.location.origin}/auth/callback`,
+          redirectTo: `${siteUrl}/auth/callback`,
         },
       });
 
@@ -127,11 +130,14 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
   const signInWithGitHub = async () => {
     setIsLoading(true);
     try {
+      // 获取网站 URL，如果环境变量不存在则使用当前来源
+      const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || window.location.origin;
+      
       // 尝试通过Supabase登录GitHub
       const { error } = await supabase.auth.signInWithOAuth({
         provider: 'github',
         options: {
-          redirectTo: `${window.location.origin}/auth/callback`,
+          redirectTo: `${siteUrl}/auth/callback`,
         },
       });
 
@@ -153,12 +159,15 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
   const signUp = async (email: string, password: string) => {
     setIsLoading(true);
     try {
+      // 获取网站 URL，如果环境变量不存在则使用当前来源
+      const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || window.location.origin;
+      
       // 尝试通过Supabase注册
       const { error } = await supabase.auth.signUp({
         email,
         password,
         options: {
-          emailRedirectTo: `${window.location.origin}/auth/callback`,
+          emailRedirectTo: `${siteUrl}/auth/callback`,
         }
       });