fix(ops): persist host resource guardrails

apps/web/Dockerfile

@@ -44,6 +44,8 @@ ARG NEXT_PUBLIC_SENTRY_DSN=
 ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
 ENV NEXT_PUBLIC_SENTRY_DSN=${NEXT_PUBLIC_SENTRY_DSN}
 ENV NEXT_TELEMETRY_DISABLED=1
+# 2026-05-05 ogt + Codex: keep self-hosted 110 runner builds from saturating CPU.
+ENV NEXT_PRIVATE_BUILD_WORKER_COUNT=1
 
 # 2026-04-06 ogt: --mount=type=cache 持久化 .next/cache，跨 build 增量編譯
 # 只有變更的頁面重新編譯，未變更頁面直接用 cache → 節省 3-4 min
@@ -51,7 +53,7 @@ ENV NEXT_TELEMETRY_DISABLED=1
 # /root/.cache/turbo 存放 turbo 的 task 輸出快取，避免每次重跑未變動的 packages
 RUN --mount=type=cache,target=/app/apps/web/.next/cache \
     --mount=type=cache,target=/root/.cache/turbo \
-    pnpm turbo build --filter=@awoooi/web
+    pnpm turbo build --filter=@awoooi/web --concurrency=1
 
 FROM base AS runner
 WORKDIR /app