refactor: Organize mail, stripe, gift, and Claude authentication modules into a new core package and update imports.

main.py

@@ -3,10 +3,10 @@ import random
 import string
 
 from config import MAIL_SYSTEMS
-from mail_service import MailPool, extract_magic_link
-from stripe_token import StripeTokenizer
-from gift_checker import GiftChecker
-from claude_auth import attack_claude, finalize_login
+from core.mail_service import MailPool, extract_magic_link
+from core.stripe_token import StripeTokenizer
+from core.gift_checker import GiftChecker
+from core.claude_auth import attack_claude, finalize_login
 
 
 # --- 主流程 (The Ritual) ---