fix(release): surface the actual Gitea API error on mirror failure

The mirror step's release id came back empty on the last real run but
nothing failed loudly — every curl response was swallowed (|| true, or
piped straight to /dev/null), so we had no idea why. Capture HTTP status +
response body on every call and exit 1 with the actual error instead of
silently uploading to a malformed //assets URL with no release id.

.gitea/workflows/release.yml

@@ -196,16 +196,22 @@ jobs:
           set -e
           create_or_get_release() {
             local mirror_tag="$1" prerelease="$2"
-            REL=$(curl -sS -X POST \
+            REL=$(curl -sS -w '\n%{http_code}' -X POST \
               -H "Authorization: token ${TOKEN}" \
               -H "Content-Type: application/json" \
               -d "{\"tag_name\":\"${mirror_tag}\",\"name\":\"Parking System ${TAG}\",\"draft\":false,\"prerelease\":${prerelease}}" \
               "${API}/repos/${MIRROR_REPO}/releases" || true)
+            echo "create response (${mirror_tag}): ${REL}"
             REL_ID=$(printf '%s' "$REL" | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2 || true)
             if [ -z "$REL_ID" ]; then
-              REL_ID=$(curl -sS -H "Authorization: token ${TOKEN}" \
-                "${API}/repos/${MIRROR_REPO}/releases/tags/${mirror_tag}" \
-                | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2 || true)
+              LOOKUP=$(curl -sS -w '\n%{http_code}' -H "Authorization: token ${TOKEN}" \
+                "${API}/repos/${MIRROR_REPO}/releases/tags/${mirror_tag}")
+              echo "tag lookup response (${mirror_tag}): ${LOOKUP}"
+              REL_ID=$(printf '%s' "$LOOKUP" | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2 || true)
+            fi
+            if [ -z "$REL_ID" ]; then
+              echo "::error::could not create or find release for tag ${mirror_tag} on ${MIRROR_REPO} — see responses above"
+              exit 1
             fi
           }
           upload_assets() {
@@ -213,11 +219,15 @@ jobs:
             for f in dist/*; do
               name=$(basename "$f")
               echo "mirroring ${name} -> release ${rel_id}"
-              curl -sS -X POST \
+              HTTP_CODE=$(curl -sS -o /tmp/upload_resp.json -w '%{http_code}' -X POST \
                 -H "Authorization: token ${TOKEN}" \
                 -H "Content-Type: application/octet-stream" \
                 --data-binary @"${f}" \
-                "${API}/repos/${MIRROR_REPO}/releases/${rel_id}/assets?name=${name}" >/dev/null
+                "${API}/repos/${MIRROR_REPO}/releases/${rel_id}/assets?name=${name}")
+              if [ "$HTTP_CODE" -ge 300 ]; then
+                echo "::error::upload of ${name} failed (HTTP ${HTTP_CODE}): $(cat /tmp/upload_resp.json)"
+                exit 1
+              fi
             done
           }