fix: include release notes in Gitea API payload

The release notes were generated but never passed to the Gitea API.
Also suppress the expected 404 from the idempotency check.

.gitea/workflows/release.yaml

@@ -153,7 +153,7 @@ jobs:
           existing=$(curl --fail --silent --show-error -o /dev/null -w "%{http_code}" \
             -H "Authorization: token $RELEASE_TOKEN" \
             "$GITEA_SERVER/api/v1/repos/$REPO/releases/tags/$TAG" \
-            || true)
+            2>/dev/null || true)
           if [ "$existing" = "200" ]; then
             echo "Release for $TAG already exists — fetching existing id"
             release_id=$(curl --fail --silent --show-error \
@@ -161,8 +161,9 @@ jobs:
               "$GITEA_SERVER/api/v1/repos/$REPO/releases/tags/$TAG" \
               | jq -r '.id')
           else
-            payload=$(jq -n --arg tag "$TAG" --arg name "$TAG" \
-              '{tag_name: $tag, name: $name, draft: false, prerelease: false}')
+            notes=$(cat release-notes.txt 2>/dev/null || echo "")
+            payload=$(jq -n --arg tag "$TAG" --arg name "$TAG" --arg body "$notes" \
+              '{tag_name: $tag, name: $name, body: $body, draft: false, prerelease: false}')
             release_id=$(curl --fail --silent --show-error \
               -H "Authorization: token $RELEASE_TOKEN" \
               -H "Content-Type: application/json" \