feat: add TYPE_LABEL class attribute to all base driver classes

Each abstract base class now carries a TYPE_LABEL: str attribute that
describes the device category in human-readable form:

  AccessPointDriver  → "Access Point"
  FirewallDriver     → "Firewall"
  HypervisorDriver   → "Hypervisor"
  OSDriver           → "OS"
  ResidentialGatewayDriver → "Gateway"
  StorageDriver      → "Storage"
  SwitchDriver       → "Switch"

Concrete drivers can override TYPE_LABEL to express a more specific
category (e.g. LinuxDriver sets "Linux"). The backend reads this
attribute to expose a type_label in the DriverInfo API response,
replacing the hardcoded DRIVER_TYPE map in the frontend.

23 tests covering presence, value, inheritance, and override.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/test_type_label.py

@@ -0,0 +1,53 @@
+"""Tests for TYPE_LABEL class attribute on all base driver classes."""
+
+import pytest
+from napalm_device_types import (
+    AccessPointDriver,
+    FirewallDriver,
+    HypervisorDriver,
+    OSDriver,
+    ResidentialGatewayDriver,
+    StorageDriver,
+    SwitchDriver,
+)
+
+
+BASE_CLASSES = [
+    (AccessPointDriver, "Access Point"),
+    (FirewallDriver, "Firewall"),
+    (HypervisorDriver, "Hypervisor"),
+    (OSDriver, "OS"),
+    (ResidentialGatewayDriver, "Gateway"),
+    (StorageDriver, "Storage"),
+    (SwitchDriver, "Switch"),
+]
+
+
+@pytest.mark.parametrize("cls, expected_label", BASE_CLASSES)
+def test_type_label_present(cls, expected_label):
+    assert hasattr(cls, "TYPE_LABEL"), f"{cls.__name__} is missing TYPE_LABEL"
+
+
+@pytest.mark.parametrize("cls, expected_label", BASE_CLASSES)
+def test_type_label_value(cls, expected_label):
+    assert cls.TYPE_LABEL == expected_label
+
+
+@pytest.mark.parametrize("cls, _", BASE_CLASSES)
+def test_type_label_is_nonempty_string(cls, _):
+    assert isinstance(cls.TYPE_LABEL, str) and cls.TYPE_LABEL
+
+
+def test_subclass_inherits_type_label():
+    class MySwitch(SwitchDriver):
+        pass
+
+    assert MySwitch.TYPE_LABEL == "Switch"
+
+
+def test_subclass_can_override_type_label():
+    class MySpecialOS(OSDriver):
+        TYPE_LABEL = "Linux"
+
+    assert MySpecialOS.TYPE_LABEL == "Linux"
+    assert OSDriver.TYPE_LABEL == "OS"  # base class unaffected