Fix CI release workflow for re-releases

- Delete existing releases before creating new ones
- Prevents "Release has no Tag" error on re-releases

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -161,6 +161,20 @@ jobs:
           # Read release notes
           BODY=$(cat release_notes.txt)
 
+          # Check if release already exists for this tag and delete it
+          EXISTING_RELEASE=$(curl -s \
+            -H "Authorization: token ${GITEA_TOKEN}" \
+            "${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}/releases/tags/${TAG_NAME}")
+
+          EXISTING_ID=$(echo "$EXISTING_RELEASE" | jq -r '.id // empty')
+
+          if [ -n "$EXISTING_ID" ] && [ "$EXISTING_ID" != "null" ]; then
+            echo "Deleting existing release ID: $EXISTING_ID"
+            curl -s -X DELETE \
+              -H "Authorization: token ${GITEA_TOKEN}" \
+              "${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}/releases/${EXISTING_ID}"
+          fi
+
           # Create release via Gitea API
           RELEASE_RESPONSE=$(curl -s -X POST \
             -H "Authorization: token ${GITEA_TOKEN}" \