refactor: Update GitHub profile ID handling for compatibility with database keys

Author: longsizhuo

auth.config.ts

@@ -53,7 +53,7 @@ export const authConfig = {
     GitHub({
       profile(profile) {
         return {
-          id: `github-${profile.id}`,
+          id: profile.id.toString(),
           name: profile.name ?? profile.login,
           email: profile.email,
           image: profile.avatar_url,

auth.ts

@@ -27,7 +27,7 @@ export const { handlers, auth, signIn, signOut } = NextAuth(() => {
       GitHub({
         profile(profile) {
           return {
-            id: `github-${profile.id}`, // 让 User.id 直接对应 GitHub ID
+            id: profile.id.toString(), // 与数据库的整数主键兼容
             name: profile.name ?? profile.login,
             email: profile.email,
             image: profile.avatar_url,