feat: better handling of oversized mails, and add junk option

config.yaml.example

@@ -23,6 +23,10 @@ context:
 polling:
   interval: "5m"  # Examples: "30s", "1m", "1h"
 
+processing:
+  max_email_size_bytes: 102400  # Maximum email body size in bytes (100KB), 0 = no limit
+  skip_junk_emails: false  # Skip emails marked as junk/spam (not yet implemented)
+
 logging:
   level: "info"  # Options: "debug", "info", "warn", "error"
   file_path: "paraclub-ai-mailer.log"