fix: remove background init timeout and allow skills reload retry

- Remove 5s thread.join() timeout so git clone/pull is not truncated
- Remove _init_complete flag, reset _init_in_progress on failure instead
- Let /reload/skills API retry initialization after network failure
- Raise GIT_HTTP_LOW_SPEED_LIMIT from 1 KB/s to 10 KB/s

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

gns3server/agent/__init__.py

@@ -37,26 +37,13 @@ try:
     from .gns3_copilot.project_agent_manager import ProjectAgentManager
     AI_COPILOT_AVAILABLE = True
 
-    # Start skills repository initialization in background with 5s timeout.
-    # This clones/pulls GNS3-Skills during server startup.
-    # If GitHub is unreachable (common in some regions), the timeout
-    # ensures the server starts without delay, using fallback defaults.
-    def _init_skills_background():
-        """Initialize skills repo - called from background thread."""
-        from gns3server.agent.gns3_copilot.skills.registry import _ensure_skills_manager
+    # Start skills repository initialization in background.
+    # Clones/pulls GNS3-Skills during server startup.
+    # Git network timeouts are configured in SkillsManager (_GIT_TIMEOUT_ENV).
+    # The daemon thread auto-terminates when the process exits.
+    from gns3server.agent.gns3_copilot.skills.registry import _ensure_skills_manager
 
-        t = threading.Thread(target=_ensure_skills_manager, daemon=True)
-        t.start()
-        t.join(5)
-        if t.is_alive():
-            log = logging.getLogger(__name__)
-            log.warning(
-                "Skills repository initialization timed out (5s). "
-                "Will use fallback defaults. "
-                "The background thread will complete when network is available."
-            )
-
-    threading.Thread(target=_init_skills_background, daemon=True).start()
+    threading.Thread(target=_ensure_skills_manager, daemon=True).start()
 
 except ImportError as e:
     # AI dependencies not installed, disable AI Copilot feature