fix(deploy): --skip-build 模式自动重启容器 + commit 校验降级

## 问题
v0.4 用 --skip-build 部署时踩到两个坑：
1. compose up -d 对无配置变更的容器是 no-op，不重启，导致 volume 挂载的
   backend 新代码不被 uvicorn 加载（这次靠手动 docker compose restart 才生效）
2. /api/health 的 commit 来自镜像 build-arg，--skip-build 不重建镜像 → commit
   校验必然失败触发 die，部署脚本非 0 退出

## 修复
- restart 阶段：SKIP_BUILD=1 时追加 docker compose restart agenteval，
  强制重载 volume 挂载的后端代码
- commit 校验：SKIP_BUILD=1 时降级为 warn（镜像未重建是预期的，代码已
  rsync+restart 生效），仅 full build 模式才 die

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/deploy-t480.sh

@@ -111,6 +111,15 @@ fi
 log "docker compose up -d"
 run ssh "$HOST" "cd $REMOTE_DIR && docker compose -f $COMPOSE_FILE up -d"
 
+# In --skip-build mode the image and compose config are unchanged, so
+# `compose up -d` is a no-op and the container keeps running the OLD uvicorn
+# process. The backend is volume-mounted, so its code on disk is already the
+# new version — but Python won't reload it without a restart. Force one.
+if [[ "$SKIP_BUILD" == "1" ]]; then
+    log "docker compose restart agenteval (reload volume-mounted backend code)"
+    run ssh "$HOST" "cd $REMOTE_DIR && docker compose -f $COMPOSE_FILE restart agenteval"
+fi
+
 # ── verify ─────────────────────────────────────────────────────────────
 log "waiting for /api/health"
 for i in $(seq 1 30); do
@@ -129,8 +138,15 @@ if [[ "$REMOTE_VERSION" != "$VERSION" ]]; then
     die "version mismatch! local=$VERSION remote=$REMOTE_VERSION (stale image?)"
 fi
 if [[ "$REMOTE_COMMIT" != "$COMMIT" && "$COMMIT" != "no-git" ]]; then
+    if [[ "$SKIP_BUILD" == "1" ]]; then
+        # /api/health's commit comes from the image build-arg, which --skip-build
+        # doesn't update. The volume-mounted code was rsync'd + the container was
+        # restarted, so the code IS current — only the metadata label lags.
+        warn "commit label still $REMOTE_COMMIT (--skip-build: image not rebuilt; code rsync'd + restarted)"
+    else
         die "commit mismatch! local=$COMMIT remote=$REMOTE_COMMIT (image not rebuilt?)"
     fi
+fi
 
 log "deploy OK: version=$VERSION commit=$COMMIT"
 log "open http://192.168.8.145:8001 to verify"