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>

pyproject.toml

@@ -0,0 +1,21 @@
+[build-system]
+requires = ["setuptools>=61"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "napalm-yealink"
+version = "0.1.0"
+description = "NAPALM driver for Yealink IP phones and video endpoints"
+requires-python = ">=3.10"
+dependencies = [
+    "napalm",
+    "napalm-device-types",
+    "requests",
+]
+
+[project.entry-points."napalm.drivers"]
+yealink = "napalm_yealink:YealinkDriver"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["napalm_yealink*"]