Add rotating file logging system with app and access loggers

Implement a centralized logging singleton using Python's built-in
  logging module with RotatingFileHandler. Replaces all print()
  statements with structured logging.

  - Create LoggerManager singleton in src/logger.py
  - Add two loggers: app (krawl.log) and access (access.log)
  - Configure 1MB file rotation with 5 backups
  - Output to both files and stdout for container compatibility
  - Update handler.py, server.py, wordlists.py to use new loggers

  Benefits over print():
  - Persistent logs survive restarts for forensic analysis
  - Automatic rotation prevents unbounded disk growth
  - Separate access/app logs for easier analysis and SIEM integration
  - Consistent timestamps and log levels across all messages
  - Configurable verbosity without code changes

src/wordlists.py

@@ -6,9 +6,10 @@ This allows easy customization without touching Python code.
 """
 
 import json
-import os
 from pathlib import Path
 
+from logger import get_app_logger
+
 
 class Wordlists:
     """Loads and provides access to wordlists from wordlists.json"""
@@ -19,15 +20,15 @@ class Wordlists:
     def _load_config(self):
         """Load wordlists from JSON file"""
         config_path = Path(__file__).parent.parent / 'wordlists.json'
-        
+
         try:
             with open(config_path, 'r') as f:
                 return json.load(f)
         except FileNotFoundError:
-            print(f"⚠️  Warning: {config_path} not found, using default values")
+            get_app_logger().warning(f"Wordlists file {config_path} not found, using default values")
             return self._get_defaults()
         except json.JSONDecodeError as e:
-            print(f"⚠️  Warning: Invalid JSON in {config_path}: {e}")
+            get_app_logger().warning(f"Invalid JSON in {config_path}: {e}")
             return self._get_defaults()
     
     def _get_defaults(self):