feat: initial napalm-yealink driver

Discovery-Fingerprinting für Yealink IP-Phones (T-series, W-series,
CP-series, VP-series) und Video-Endpoints.

- TYPE_LABEL = "Phone" (Override von AccessPointDriver)
- SNMP_OBJECT_ID_PREFIX = "1.3.6.1.4.1.37403" (Yealink Enterprise OID)
- HTTP_FINGERPRINT: "yealink" (mandatory, weight 10), Modell-Patterns
- get_facts(): liest phoneName + firmware aus dem noauth-API-Response
  (/api/v1/system/info liefert Gerätedaten auch ohne Authentication)
- Login via MD5-gehashtem Passwort auf /api/v1/session/login (HTTPS)

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

tests/test_fingerprint.py

@@ -0,0 +1,43 @@
+"""Fingerprint tests for YealinkDriver."""
+
+from napalm_device_types import DeviceTypeDriver, FingerprintRule
+from napalm_yealink import YealinkDriver
+
+
+def test_yealink_is_device_type_driver():
+    assert issubclass(YealinkDriver, DeviceTypeDriver)
+
+
+def test_type_label():
+    assert YealinkDriver.TYPE_LABEL == "Phone"
+
+
+def test_vendor():
+    assert YealinkDriver.VENDOR == "Yealink"
+
+
+def test_driver_name():
+    assert YealinkDriver.DRIVER_NAME == "yealink"
+
+
+def test_snmp_oid_prefix():
+    assert YealinkDriver.SNMP_OBJECT_ID_PREFIX == "1.3.6.1.4.1.37403"
+
+
+def test_http_fingerprint_mandatory_yealink():
+    mandatory = [r for r in YealinkDriver.HTTP_FINGERPRINT if r.mandatory]
+    assert any(r.pattern == "yealink" for r in mandatory)
+
+
+def test_fingerprint_matches_t58_title():
+    """'Yealink T58 Phone' im Titel → mandatory 'yealink' trifft zu."""
+    combined = "yealink t58 phone   nginx "
+    mandatory = [r for r in YealinkDriver.HTTP_FINGERPRINT if r.mandatory]
+    assert all(r.pattern in combined for r in mandatory)
+
+
+def test_fingerprint_does_not_match_cisco():
+    """Cisco-Seite enthält kein 'yealink' → mandatory Pattern fehlt."""
+    combined = "cisco ip phone cp-8841   "
+    mandatory = [r for r in YealinkDriver.HTTP_FINGERPRINT if r.mandatory]
+    assert not all(r.pattern in combined for r in mandatory)