ci: add automated PR labeler and stale issue/PR workflows

.github/labeler.yml

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+documentation:
+  - changed-files:
+    - any-glob-to-any-file:
+      - "README.md"
+      - "docs/**"
+
+source:
+  - changed-files:
+    - any-glob-to-any-file:
+      - "src/**"
+
+dependencies:
+  - changed-files:
+    - any-glob-to-any-file:
+      - "package.json"
+      - "package-lock.json"
+
+ci:
+  - changed-files:
+    - any-glob-to-any-file:
+      - ".github/**"
+
+configuration:
+  - changed-files:
+    - any-glob-to-any-file:
+      - "vite.config.js"
+      - "tsconfig.json"
+      - "eslint.config.js"

.github/workflows/labeler.yml

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+name: Label PRs
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  label:
+    name: Apply labels
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/stale.yml

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+name: Mark stale issues and PRs
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+
+jobs:
+  stale:
+    name: Stale
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v9
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-issue-message: >
+            This issue has been automatically marked as stale because it has had no
+            activity for 60 days. It will be closed in 7 days unless further activity occurs.
+          stale-pr-message: >
+            This pull request has been automatically marked as stale because it has had no
+            activity for 30 days. It will be closed in 7 days unless further activity occurs.
+          close-issue-message: "Closed due to inactivity. Feel free to reopen if this is still relevant."
+          close-pr-message: "Closed due to inactivity. Feel free to reopen if this is still relevant."
+          days-before-issue-stale: 60
+          days-before-pr-stale: 30
+          days-before-close: 7
+          stale-issue-label: stale
+          stale-pr-label: stale
+          exempt-issue-labels: "pinned,security,bug"
+          exempt-pr-labels: "pinned,security"