ci(runtime): align external front workflow trigger paths

Normalize DocV external front runtime workflow path filters to keep release runtime checks synchronized with current repository layout.

.gitea/workflows/docv-front-runtime-release.yml

@@ -5,7 +5,7 @@ on:
     branches:
       - "release/**"
     paths:
-      - "**/src/**"
+      - "**/src/lib/docv-sdk/**"
       - "**/package.json"
       - "**/package-lock.json"
       - ".gitea/workflows/docv-front-runtime-release.yml"
@@ -51,7 +51,7 @@ jobs:
           test -n "${DOCV_IT_API_VERSION}"
           test -n "${DOCV_IT_ORIGIN}"
 
-      - name: Run DocV runtime integration checks on discovered fronts
+      - name: Run mandatory DocV runtime integration checks on all fronts
         run: |
           set -euo pipefail
           mapfile -t docv_surfaces < <(node <<'NODE'
@@ -101,8 +101,8 @@ jobs:
           NODE
           )
           if [[ "${#docv_surfaces[@]}" -eq 0 ]]; then
-            echo "[docv-front-runtime-release] no docv runtime integration surface found, skip."
-            exit 0
+            echo "[docv-front-runtime-release] no docv runtime integration surface found" >&2
+            exit 1
           fi
           for surface in "${docv_surfaces[@]}"; do
             if [[ ! -f "${surface}/package.json" ]]; then