feat(automation): add recursive render_value to templating

surfsense_backend/app/automations/templating/__init__.py

@@ -3,10 +3,11 @@
 from __future__ import annotations
 
 from .context import build_run_context
-from .render import evaluate_predicate, render_template
+from .render import evaluate_predicate, render_template, render_value
 
 __all__ = [
     "build_run_context",
     "evaluate_predicate",
     "render_template",
+    "render_value",
 ]

surfsense_backend/app/automations/templating/render.py

@@ -16,3 +16,14 @@ def render_template(template: str, context: Mapping[str, Any]) -> str:
 def evaluate_predicate(expression: str, context: Mapping[str, Any]) -> bool:
     """Evaluate a Jinja expression (not a template body) and coerce to bool."""
     return bool(ENV.compile_expression(expression)(**context))
+
+
+def render_value(value: Any, context: Mapping[str, Any]) -> Any:
+    """Recursively render every string in a JSON-like value structure."""
+    if isinstance(value, str):
+        return render_template(value, context)
+    if isinstance(value, dict):
+        return {k: render_value(v, context) for k, v in value.items()}
+    if isinstance(value, list):
+        return [render_value(v, context) for v in value]
+    return value