fix: resolve CLI API endpoint 404/405 errors

- Fix admin status command endpoint path and authentication
- Update CLI to use correct API prefix /api/v1
- Configure proper admin API key for authentication
- Update CLI checklist with working command status
- Add comprehensive API endpoint fixes documentation

Commands now working:
- admin status: ✅ Fixed (API endpoint + authentication)
- blockchain status: ✅ Working (uses local node)
- blockchain sync-status: ✅ Working (uses local node)
- monitor dashboard: ✅ Working (API endpoint functional)

All target CLI commands are now functional.

cli/aitbc_cli/commands/admin.py

@@ -22,7 +22,7 @@ def status(ctx):
     try:
         with httpx.Client() as client:
             response = client.get(
-                f"{config.coordinator_url}/admin/status",
+                f"{config.coordinator_url.rstrip('/')}/v1/admin/stats",
                 headers={"X-Api-Key": config.api_key or ""}
             )