Add Dependabot for npm (server + client) and github-actions

Author: maxonfjvipon

.github/dependabot.yml

@@ -0,0 +1,19 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026 Max Trunnikov
+# SPDX-License-Identifier: MIT
+---
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 10
+  - package-ecosystem: npm
+    directory: /client
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 10
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly