refactor(automations): vertical-slice actions and triggers by domain

surfsense_backend/app/automations/triggers/__init__.py

@@ -0,0 +1,20 @@
+"""Triggers domain: registry surface + built-in trigger packages.
+
+Each trigger lives in its own subpackage (``manual/``, ``schedule/``, ...) and
+self-registers at import time via its ``definition`` module.
+"""
+
+from __future__ import annotations
+
+from .store import all_triggers, get_trigger, register_trigger
+from .types import TriggerDefinition
+
+__all__ = [
+    "TriggerDefinition",
+    "all_triggers",
+    "get_trigger",
+    "register_trigger",
+]
+
+# Built-in triggers self-register at import time.
+from . import manual, schedule  # noqa: E402, F401