feat: Home Assistant integration — WebSocket connection, automation conditions, UI

Add full Home Assistant integration via WebSocket API:
- HARuntime: persistent WebSocket client with auth, auto-reconnect, entity state cache
- HAManager: ref-counted runtime pool (like WeatherManager)
- HomeAssistantCondition: new automation trigger type matching entity states
- REST API: CRUD for HA sources + /test, /entities, /status endpoints
- /api/v1/system/integrations-status: combined MQTT + HA dashboard indicators
- Frontend: HA Sources tab in Streams, condition type in automation editor
- Modal editor with host, token, SSL, entity filters
- websockets>=13.0 dependency added

server/src/wled_controller/storage/automation.py

@@ -180,6 +180,34 @@ class StartupCondition(Condition):
         return cls()
 
 
+@dataclass
+class HomeAssistantCondition(Condition):
+    """Activate based on a Home Assistant entity state."""
+
+    condition_type: str = "home_assistant"
+    ha_source_id: str = ""  # references HomeAssistantSource
+    entity_id: str = ""  # e.g. "binary_sensor.front_door"
+    state: str = ""  # expected state value
+    match_mode: str = "exact"  # "exact" | "contains" | "regex"
+
+    def to_dict(self) -> dict:
+        d = super().to_dict()
+        d["ha_source_id"] = self.ha_source_id
+        d["entity_id"] = self.entity_id
+        d["state"] = self.state
+        d["match_mode"] = self.match_mode
+        return d
+
+    @classmethod
+    def from_dict(cls, data: dict) -> "HomeAssistantCondition":
+        return cls(
+            ha_source_id=data.get("ha_source_id", ""),
+            entity_id=data.get("entity_id", ""),
+            state=data.get("state", ""),
+            match_mode=data.get("match_mode", "exact"),
+        )
+
+
 _CONDITION_MAP: Dict[str, Type[Condition]] = {
     "always": AlwaysCondition,
     "application": ApplicationCondition,
@@ -189,6 +217,7 @@ _CONDITION_MAP: Dict[str, Type[Condition]] = {
     "mqtt": MQTTCondition,
     "webhook": WebhookCondition,
     "startup": StartupCondition,
+    "home_assistant": HomeAssistantCondition,
 }
 
 
@@ -243,6 +272,10 @@ class Automation:
             deactivation_mode=data.get("deactivation_mode", "none"),
             deactivation_scene_preset_id=data.get("deactivation_scene_preset_id"),
             tags=data.get("tags", []),
-            created_at=datetime.fromisoformat(data.get("created_at", datetime.now(timezone.utc).isoformat())),
-            updated_at=datetime.fromisoformat(data.get("updated_at", datetime.now(timezone.utc).isoformat())),
+            created_at=datetime.fromisoformat(
+                data.get("created_at", datetime.now(timezone.utc).isoformat())
+            ),
+            updated_at=datetime.fromisoformat(
+                data.get("updated_at", datetime.now(timezone.utc).isoformat())
+            ),
         )