Add configurable HTTP Server header for deception

Add SERVER_HEADER environment variable to customize the HTTP Server
  response header, defaulting to Apache/2.2.22 (Ubuntu). This allows the
  honeypot to masquerade as different web servers to attract attackers.

  - Add server_header field to Config dataclass
  - Override version_string() in Handler to return configured header
  - Update documentation and all deployment configs

src/config.py

@@ -21,6 +21,7 @@ class Config:
     api_server_port: int = 8080
     api_server_path: str = "/api/v2/users"
     probability_error_codes: int = 0  # Percentage (0-100)
+    server_header: str = "Apache/2.2.22 (Ubuntu)"
 
     @classmethod
     def from_env(cls) -> 'Config':
@@ -44,5 +45,6 @@ class Config:
             api_server_url=os.getenv('API_SERVER_URL'),
             api_server_port=int(os.getenv('API_SERVER_PORT', 8080)),
             api_server_path=os.getenv('API_SERVER_PATH', '/api/v2/users'),
-            probability_error_codes=int(os.getenv('PROBABILITY_ERROR_CODES', 5))
+            probability_error_codes=int(os.getenv('PROBABILITY_ERROR_CODES', 5)),
+            server_header=os.getenv('SERVER_HEADER', 'Apache/2.2.22 (Ubuntu)')
         )

src/handler.py

@@ -48,6 +48,10 @@ class Handler(BaseHTTPRequestHandler):
         """Extract user agent from request"""
         return self.headers.get('User-Agent', '')
 
+    def version_string(self) -> str:
+        """Return custom server version for deception."""
+        return self.config.server_header
+
     def _should_return_error(self) -> bool:
         """Check if we should return an error based on probability"""
         if self.config.probability_error_codes <= 0:

src/server.py

@@ -32,6 +32,7 @@ def print_usage():
     print('  DASHBOARD_SECRET_PATH - Secret path for dashboard (auto-generated if not set)')
     print('  PROBABILITY_ERROR_CODES - Probability (0-100) to return HTTP error codes (default: 0)')
     print('  CHAR_SPACE            - Characters for random links')
+    print('  SERVER_HEADER         - HTTP Server header for deception (default: Apache/2.2.22 (Ubuntu))')
 
 
 def main():