Support enable/disable_rain_delay services on rain delay switch

The valve service handler routes service calls through both VALVE_DOMAIN
and SWITCH_DOMAIN, but only BHyveZoneValve implemented enable_rain_delay
and disable_rain_delay. Calling bhyve.enable_rain_delay with a rain
delay switch entity logged "Service is not supported by entity" and the
requested hours were never applied.

Add matching methods to BHyveRainDelaySwitch so the service resolves on
the natural target entity, and delegate async_turn_on/off through them
to keep a single path to the client.

Fixes #407

Author: claude

custom_components/bhyve/switch.py

@@ -480,8 +480,16 @@ def extra_state_attributes(self) -> dict[str, Any]:
 
     async def async_turn_on(self, **_kwargs: Any) -> None:
         """Turn the switch on."""
-        await self.coordinator.client.set_rain_delay(self._device_id, 24)
+        await self.enable_rain_delay()
 
     async def async_turn_off(self, **_kwargs: Any) -> None:
         """Turn the switch off."""
+        await self.disable_rain_delay()
+
+    async def enable_rain_delay(self, hours: int = 24) -> None:
+        """Enable rain delay for the device."""
+        await self.coordinator.client.set_rain_delay(self._device_id, hours)
+
+    async def disable_rain_delay(self) -> None:
+        """Disable rain delay for the device."""
         await self.coordinator.client.set_rain_delay(self._device_id, 0)

tests/test_switch.py

@@ -849,6 +849,44 @@ async def test_rain_delay_switch_turn_off(
         # Verify set_rain_delay was called with 0 hours to disable
         coordinator.client.set_rain_delay.assert_called_once_with(TEST_DEVICE_ID, 0)
 
+    async def test_rain_delay_switch_enable_rain_delay(
+        self,
+        mock_sprinkler_device: BHyveDevice,
+        mock_coordinator: MagicMock,
+    ) -> None:
+        """Test enable_rain_delay service method honours custom hours."""
+        description = create_rain_delay_switch_description(mock_sprinkler_device)
+        switch = BHyveRainDelaySwitch(
+            coordinator=mock_coordinator,
+            device=mock_sprinkler_device,
+            description=description,
+        )
+
+        await switch.enable_rain_delay(hours=5)
+
+        mock_coordinator.client.set_rain_delay.assert_called_once_with(
+            TEST_DEVICE_ID, 5
+        )
+
+    async def test_rain_delay_switch_disable_rain_delay(
+        self,
+        mock_sprinkler_device: BHyveDevice,
+        mock_coordinator: MagicMock,
+    ) -> None:
+        """Test disable_rain_delay service method clears the delay."""
+        description = create_rain_delay_switch_description(mock_sprinkler_device)
+        switch = BHyveRainDelaySwitch(
+            coordinator=mock_coordinator,
+            device=mock_sprinkler_device,
+            description=description,
+        )
+
+        await switch.disable_rain_delay()
+
+        mock_coordinator.client.set_rain_delay.assert_called_once_with(
+            TEST_DEVICE_ID, 0
+        )
+
     async def test_rain_delay_switch_websocket_event(
         self,
         mock_sprinkler_device: BHyveDevice,