Move Gitea workflows to repository root

.gitea/workflows/repo-cleanup.yml

@@ -0,0 +1,31 @@
+name: Repository Cleanup
+
+on:
+  schedule:
+    - cron: "0 5 * * 1"
+  workflow_dispatch:
+
+jobs:
+  cleanup-report:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Report generated or sensitive tracked files
+        shell: bash
+        run: |
+          git ls-files | grep -E '(^opera-cache-cleaner-extension/dist/|^opera-cache-cleaner-extension/build/|^opera-cache-cleaner-extension/out/|\.log$|\.tmp$|\.env|\.pem$|\.key$|\.token$)' && {
+            echo "Tracked generated or sensitive-looking files found."
+            exit 1
+          } || true
+
+      - name: Report large tracked files
+        shell: bash
+        run: |
+          large_files="$(git ls-files -z | xargs -0 du -k | awk '$1 > 1024 { print }')"
+          if [ -n "$large_files" ]; then
+            echo "$large_files"
+            echo "Tracked files above 1 MiB should be reviewed."
+            exit 1
+          fi