feat(agent): update import paths for gns3_copilot modules

Updated import statements across multiple agent files to use absolute paths starting with `gns3server.agent.gns3_copilot` instead of relative `gns3_copilot` imports. This ensures proper module resolution within the gns3-server package structure and prevents import errors when the agent is executed from different contexts.

gns3server/agent/gns3_copilot/utils/get_gns3_device_port.py

@@ -34,7 +34,7 @@ def get_device_ports_from_topology(
 
     try:
         # Lazy import to avoid circular dependency
-        from gns3_copilot.gns3_client import GNS3TopologyTool
+        from gns3server.agent.gns3_copilot.gns3_client import GNS3TopologyTool
 
         # Get topology information
         topo = GNS3TopologyTool()

gns3server/agent/gns3_copilot/utils/llm_config_helper.py

@@ -11,7 +11,7 @@ This allows the copilot module to access API keys that are hidden from API respo
 while leveraging the API's default_config selection logic.
 
 Usage:
-    from gns3_copilot.utils.llm_config_helper import get_user_llm_config
+    from gns3server.agent.gns3_copilot.utils.llm_config_helper import get_user_llm_config
 
     # Get user's default LLM config (with API key)
     config = get_user_llm_config(user_id, jwt_token, gns3_url)
@@ -232,7 +232,7 @@ def _detect_gns3_url() -> Optional[str]:
         GNS3 server URL, or None if detection failed
     """
     try:
-        from gns3_copilot.gns3_client.connector_factory import (
+        from gns3server.agent.gns3_copilot.gns3_client.connector_factory import (
             _get_url_from_controller,
             _get_url_from_config,
             DEFAULT_GNS3_URL