Add zeroconf discovery to Freebox (#47045)

* Add zeroconf discovery to Freebox

- remove deprecated discovery
- tried with SSDP too but the presentation URL is not the same (*.fbxos.fr for zeroconf, http://mafreebox.freebox.fr/ for SSDP)
- so config entry unique_id should be the MAC (included into SSDP, but not zeroconf, can be retrieve from `fbx.system.get_config()`)
- DHCP discovery might be added in the future too

* host and port are required on zeroconf

* cleanup in other PR

tests/components/freebox/test_config_flow.py

@@ -10,7 +10,7 @@ import pytest
 
 from homeassistant import data_entry_flow
 from homeassistant.components.freebox.const import DOMAIN
-from homeassistant.config_entries import SOURCE_IMPORT, SOURCE_USER
+from homeassistant.config_entries import SOURCE_IMPORT, SOURCE_USER, SOURCE_ZEROCONF
 from homeassistant.const import CONF_HOST, CONF_PORT
 
 from tests.common import MockConfigEntry
@@ -18,6 +18,25 @@ from tests.common import MockConfigEntry
 HOST = "myrouter.freeboxos.fr"
 PORT = 1234
 
+MOCK_ZEROCONF_DATA = {
+    "host": "192.168.0.254",
+    "port": 80,
+    "hostname": "Freebox-Server.local.",
+    "type": "_fbx-api._tcp.local.",
+    "name": "Freebox Server._fbx-api._tcp.local.",
+    "properties": {
+        "api_version": "8.0",
+        "device_type": "FreeboxServer1,2",
+        "api_base_url": "/api/",
+        "uid": "b15ab20debb399f95001a9ca207d2777",
+        "https_available": "1",
+        "https_port": f"{PORT}",
+        "box_model": "fbxgw-r2/full",
+        "box_model_name": "Freebox Server (r2)",
+        "api_domain": HOST,
+    },
+}
+
 
 @pytest.fixture(name="connect")
 def mock_controller_connect():
@@ -66,6 +85,17 @@ async def test_import(hass):
     assert result["step_id"] == "link"
 
 
+async def test_zeroconf(hass):
+    """Test zeroconf step."""
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN,
+        context={"source": SOURCE_ZEROCONF},
+        data=MOCK_ZEROCONF_DATA,
+    )
+    assert result["type"] == data_entry_flow.RESULT_TYPE_FORM
+    assert result["step_id"] == "link"
+
+
 async def test_link(hass, connect):
     """Test linking."""
     result = await hass.config_entries.flow.async_init(