feat(copilot): add Netmiko device list generator and simplify Huawei driver

- Add script to generate Markdown documentation of all Netmiko supported
     devices (SSH and Telnet), grouped by platform with source attribution
   - Highlight custom GNS3-Copilot devices with "Custom ✨" marker
   - Auto-generate device list to docs/gns3-copilot/netmiko_devices.md
   - Simplify HuaweiTelnetCE driver: remove redundant aliases
     (huawei_ce, huawei_telnet_ce_telnet), keep only huawei_telnet_ce
   - Update tests to match simplified device registration

gns3server/agent/gns3_copilot/utils/custom_netmiko/tests/test_huawei_ce.py

@@ -51,10 +51,8 @@ class TestHuaweiTelnetCEDriver(unittest.TestCase):
 
         # Check CLASS_MAPPER_BASE
         self.assertIn("huawei_telnet_ce", CLASS_MAPPER_BASE)
-        self.assertEqual(CLASS_MAPPER_BASE["huawei_telnet_ce"], self.HuaweiTelnetCE)
-
-        # Check alias
-        self.assertIn("huawei_ce", CLASS_MAPPER)
+        self.assertEqual(CLASS_MAPPER_BASE["huawei_telnet_ce"],
+                         self.HuaweiTelnetCE)
 
     def test_inheritance_from_huawei_base(self):
         """Test that HuaweiTelnetCE inherits from HuaweiBase."""