fix(ci): generate per-release changelog body using positional range arg

git-cliff's --tag flag sets the display label for unreleased commits;
it does not scope commits to a range. Passing a range string to --tag
caused git-cliff to emit the full cumulative history for every release.

Move the revision range from --tag to a positional argument so only
commits between PREV_TAG and CURRENT_TAG appear in each release body.
CHANGELOG.md generation is unaffected (still full history).

.gitea/workflows/auto-tag.yml

@@ -138,8 +138,8 @@ jobs:
           PREV_TAG=$(git tag --sort=-version:refname | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' \
             | grep -v "^${CURRENT_TAG}$" | head -1 || echo "")
           if [ -n "$PREV_TAG" ]; then
-            # Generate changelog for current tag only using tag range
-            git-cliff --config cliff.toml --tag "${PREV_TAG}..${CURRENT_TAG}" > /tmp/release_body.md || true
+            # Generate release body for this tag only (commits since previous tag)
+            git-cliff --config cliff.toml "${PREV_TAG}..${CURRENT_TAG}" > /tmp/release_body.md || true
             # Generate full CHANGELOG.md from all tags
             git-cliff --config cliff.toml --output CHANGELOG.md
           else