Add Dependabot for automated dependency and GitHub Actions updates

.github/dependabot.yml

@@ -0,0 +1,50 @@
+# Dependabot configuration
+# Docs: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+version: 2
+updates:
+  # Root package.json / pnpm-lock.yaml
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "06:00"
+      timezone: "Etc/UTC"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+    commit-message:
+      prefix: "chore(deps)"
+      prefix-development: "chore(deps-dev)"
+    groups:
+      # Minor and patch bumps arrive as one weekly PR per group.
+      # Major bumps stay as individual PRs so breaking changes get their own review.
+      production-minor-patch:
+        dependency-type: "production"
+        update-types:
+          - "minor"
+          - "patch"
+      development-minor-patch:
+        dependency-type: "development"
+        update-types:
+          - "minor"
+          - "patch"
+
+  # GitHub Actions used in .github/workflows/
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "06:00"
+      timezone: "Etc/UTC"
+    open-pull-requests-limit: 3
+    labels:
+      - "dependencies"
+      - "ci"
+    commit-message:
+      prefix: "chore(ci)"
+    groups:
+      actions:
+        patterns:
+          - "*"