fix: resolve valve priority for actions and filters via class instantiation (#21841)

fix: resolve valve priority for actions and filters via class instantiation

The priority sorting for action buttons and filter execution order
read valve data directly from the database JSON column using
Functions.get_function_valves_by_id(). This returns only explicitly
saved values — when a developer defines priority as a class default
in their Valves definition (e.g. priority: int = 5) without ever
opening the Valves UI to persist it, the database column remains
empty. Every function then resolves to priority 0, and the preceding
set() deduplication produces non-deterministic iteration order that
the stable sort preserves — resulting in random button placement on
every page load.

The fix instantiates the Valves class with database values as keyword
overrides: Valves(**(db_valves or {})). This merges any persisted
overrides onto the code-defined defaults, matching the pattern already
established in the action execution handler, filter processing
pipeline, and tool module initialization. A secondary sort key (the
function ID) ensures fully deterministic ordering even when multiple
functions share the same priority value.

Affected locations:
- get_action_priority in utils/models.py (action button ordering)
- get_priority in utils/filter.py (filter execution ordering)

backend/open_webui/utils/models.py

@@ -332,8 +332,15 @@ async def get_all_models(request, refresh: bool = False, user: UserModel = None)
                     meta[key] = copy.deepcopy(value)
 
     def get_action_priority(action_id):
-        valves = Functions.get_function_valves_by_id(action_id)
-        return valves.get("priority", 0) if valves else 0
+        try:
+            function_module = request.app.state.FUNCTIONS.get(action_id)
+            if function_module and hasattr(function_module, "Valves"):
+                valves_db = Functions.get_function_valves_by_id(action_id)
+                valves = function_module.Valves(**(valves_db if valves_db else {}))
+                return getattr(valves, "priority", 0)
+        except Exception:
+            pass
+        return 0
 
     for model in models:
         action_ids = [
@@ -341,7 +348,7 @@ async def get_all_models(request, refresh: bool = False, user: UserModel = None)
             for action_id in list(set(model.pop("action_ids", []) + global_action_ids))
             if action_id in enabled_action_ids
         ]
-        action_ids.sort(key=get_action_priority)
+        action_ids.sort(key=lambda aid: (get_action_priority(aid), aid))
 
         filter_ids = [
             filter_id