feat: add stale issue and PR management workflow

.github/workflows/stale.yml

@@ -0,0 +1,48 @@
+name: Stale Issues and PRs
+
+on:
+  schedule:
+    - cron: "0 0 * * 1" # Weekly on Monday at midnight UTC
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  stale:
+    name: Manage Stale Issues and PRs
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/stale@v9
+        with:
+          # Issue configuration
+          days-before-issue-stale: 60
+          days-before-issue-close: 14
+          stale-issue-label: stale
+          stale-issue-message: >
+            This issue has been automatically marked as stale because it has
+            not had any activity in the last 60 days. It will be closed in
+            14 days if no further activity occurs. If this issue is still
+            relevant, please leave a comment or remove the stale label.
+            Thank you for your contributions!
+          close-issue-message: >
+            This issue has been automatically closed due to inactivity.
+            If you believe this issue is still relevant, please feel free
+            to reopen it with updated context. Thank you!
+          exempt-issue-labels: "priority: high,help wanted"
+
+          # PR configuration
+          days-before-pr-stale: 30
+          days-before-pr-close: 7
+          stale-pr-label: stale
+          stale-pr-message: >
+            This pull request has been automatically marked as stale because
+            it has not had any activity in the last 30 days. It will be
+            closed in 7 days if no further activity occurs. If this PR is
+            still a work in progress, please leave a comment or push new
+            changes to keep it active. Thank you for your contributions!
+          close-pr-message: >
+            This pull request has been automatically closed due to
+            inactivity. If you would like to continue this work, please
+            feel free to reopen it or create a new pull request. Thank you!