fix: add npm and github-actions ecosystems to dependabot, add stale label

- Add npm ecosystem for /frontend dependencies (monthly)
- Add github-actions ecosystem for workflow updates (monthly)
- Create stale label for stale bot auto-labeling

Jira: OR-1358

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: abhizipstack

.github/dependabot.yml

@@ -1,12 +1,21 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
 # https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
 
 version: 2
 updates:
-  - package-ecosystem: "pip" # See documentation for possible values
-    directory: "/" # Location of package manifests
+  - package-ecosystem: "pip"
+    directory: "/"
     schedule:
       interval: "monthly"
-    target-branch: "main" # The branch to create pull requests against
+    target-branch: "main"
+
+  - package-ecosystem: "npm"
+    directory: "/frontend"
+    schedule:
+      interval: "monthly"
+    target-branch: "main"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    target-branch: "main"