chore: remove old YAML config files, keep config.example.json

config.yaml.example

@@ -1,32 +0,0 @@
-email_accounts:
-  - imap_server: "imap.gmail.com"
-    imap_port: 993
-    username: "your_email@gmail.com"
-    password: "your_app_password"
-    use_ssl: true
-    smtp:
-      server: "smtp.gmail.com"
-      port: 465
-      use_ssl: true
-
-  - imap_server: "imap.126.com"
-    imap_port: 993
-    username: "your_email@126.com"
-    password: "your_auth_code"
-    use_ssl: true
-    smtp:
-      server: "smtp.126.com"
-      port: 465
-      use_ssl: true
-
-ai:
-  api_key: "sk-your_deepseek_api_key"
-  model: "deepseek-chat"
-  base_url: "https://api.deepseek.com"
-
-telegram:
-  bot_token: "1234567890:ABCdefGHIjklmNOPqrstUVwxyz"
-  chat_id: "123456789"
-
-polling:
-  interval_seconds: 60