Refactor AuthContext into smaller files

Refactors the AuthContext.tsx file into smaller, more manageable files to improve code organization and maintainability. The functionality remains the same.

src/contexts/auth/AuthProvider.tsx

@@ -0,0 +1,78 @@
+
+import React, { createContext, useContext, useEffect, useState } from 'react';
+import { supabase } from '@/lib/supabase';
+import { Session, User } from '@supabase/supabase-js';
+import { toast } from '@/hooks/useToast.wrapper';
+import { AuthContextType } from './types';
+import * as authActions from './authActions';
+
+const AuthContext = createContext<AuthContextType | undefined>(undefined);
+
+export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
+  const [session, setSession] = useState<Session | null>(null);
+  const [user, setUser] = useState<User | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    // 현재 세션 체크
+    const getSession = async () => {
+      try {
+        const { data, error } = await supabase.auth.getSession();
+        
+        if (error) {
+          console.error('세션 로딩 중 오류:', error);
+          toast({
+            title: '세션 로드 오류',
+            description: '사용자 세션을 불러오는 중 문제가 발생했습니다.',
+            variant: 'destructive',
+          });
+        } else {
+          setSession(data.session);
+          setUser(data.session?.user ?? null);
+        }
+      } catch (error) {
+        console.error('세션 확인 중 예외 발생:', error);
+      } finally {
+        setLoading(false);
+      }
+    };
+
+    getSession();
+
+    // auth 상태 변경 리스너
+    const { data: { subscription } } = supabase.auth.onAuthStateChange(
+      async (event, session) => {
+        console.log('Supabase auth 이벤트:', event);
+        setSession(session);
+        setUser(session?.user ?? null);
+        setLoading(false);
+      }
+    );
+
+    // 리스너 정리
+    return () => {
+      subscription.unsubscribe();
+    };
+  }, []);
+
+  // 인증 작업 메서드들
+  const value: AuthContextType = {
+    session,
+    user,
+    loading,
+    signIn: authActions.signIn,
+    signUp: authActions.signUp,
+    signOut: authActions.signOut,
+    resetPassword: authActions.resetPassword,
+  };
+
+  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
+};
+
+export const useAuth = () => {
+  const context = useContext(AuthContext);
+  if (context === undefined) {
+    throw new Error('useAuth는 AuthProvider 내부에서 사용해야 합니다');
+  }
+  return context;
+};