🛡️ refactor: Scope Action Mutations by Parent Resource Ownership (#12237)

* 🛡️ fix: Scope action mutations by parent resource ownership

Prevent cross-tenant action overwrites by validating that an existing
action's agent_id/assistant_id matches the URL parameter before allowing
updates or deletes. Without this, a user with EDIT access on their own
agent could reference a foreign action_id to hijack another agent's
action record.

* 🛡️ fix: Harden action ownership checks and scope write filters

- Remove && short-circuit that bypassed the guard when agent_id or
  assistant_id was falsy (e.g. assistant-owned actions have no agent_id,
  so the check was skipped entirely on the agents route).
- Include agent_id / assistant_id in the updateAction and deleteAction
  query filters so the DB write itself enforces ownership atomically.
- Log a warning when deleteAction returns null (silent no-op from
  data-integrity mismatch).

* 📝 docs: Update Action model JSDoc to reflect scoped query params

* ✅ test: Add Action ownership scoping tests

Cover update, delete, and cross-type protection scenarios using
MongoMemoryServer to verify that scoped query filters (agent_id,
assistant_id) prevent cross-tenant overwrites and deletions at the
database level.

* 🛡️ fix: Scope updateAction filter in agent duplication handler

* 🐛 fix: Use action metadata domain instead of action_id when duplicating agent actions

The duplicate handler was splitting `action.action_id` by `actionDelimiter`
to extract the domain, but `action_id` is a bare nanoid that doesn't
contain the delimiter. This produced malformed entries in the duplicated
agent's actions array (nanoid_action_newNanoid instead of
domain_action_newNanoid). The domain is available on `action.metadata.domain`.

* ✅ test: Add integration tests for agent duplication action handling

Uses MongoMemoryServer with real Agent and Action models to verify:
- Duplicated actions use metadata.domain (not action_id) for the
  agent actions array entries
- Sensitive metadata fields are stripped from duplicated actions
- Original action documents are not modified

api/server/routes/agents/actions.js

@@ -143,6 +143,9 @@ router.post(
 
       if (actions_result && actions_result.length) {
         const action = actions_result[0];
+        if (action.agent_id !== agent_id) {
+          return res.status(403).json({ message: 'Action does not belong to this agent' });
+        }
         metadata = { ...action.metadata, ...metadata };
       }
 
@@ -184,7 +187,7 @@ router.post(
       }
 
       /** @type {[Action]} */
-      const updatedAction = await updateAction({ action_id }, actionUpdateData);
+      const updatedAction = await updateAction({ action_id, agent_id }, actionUpdateData);
 
       const sensitiveFields = ['api_key', 'oauth_client_id', 'oauth_client_secret'];
       for (let field of sensitiveFields) {
@@ -251,7 +254,13 @@ router.delete(
         { tools: updatedTools, actions: updatedActions },
         { updatingUserId: req.user.id, forceVersion: true },
       );
-      await deleteAction({ action_id });
+      const deleted = await deleteAction({ action_id, agent_id });
+      if (!deleted) {
+        logger.warn('[Agent Action Delete] No matching action document found', {
+          action_id,
+          agent_id,
+        });
+      }
       res.status(200).json({ message: 'Action deleted successfully' });
     } catch (error) {
       const message = 'Trouble deleting the Agent Action';