docs(readme): add K3s quickstart deployment section

Add a K3s subsection under Kubernetes in both README.md
and README_zh.md with a one-line deploy command and link
to the full k3s README.

README.md

@@ -327,6 +327,16 @@ kubectl apply -f deploy/k8s/services.yaml
 kubectl apply -f deploy/k8s/ingress.yaml
 ```
 
+### K3s
+
+For K3s clusters, a self-contained quickstart overlay is available under [`deploy/k3s/overlays/quickstart/`](./deploy/k3s/overlays/quickstart). It includes PostgreSQL, Redis, and all SkillHub services, and is compatible with K3s' default Traefik Ingress:
+
+```bash
+kubectl apply -k deploy/k3s/overlays/quickstart/
+```
+
+See [`deploy/k3s/README_zh.md`](./deploy/k3s/README_zh.md) for full details.
+
 ## Smoke Test
 
 A lightweight smoke test script is available at [`scripts/smoke-test.sh`](./scripts/smoke-test.sh).

README_zh.md

@@ -203,6 +203,16 @@ kubectl apply -f deploy/k8s/
 helm install skillhub ./deploy/helm
 ```
 
+### K3s 一键部署
+
+针对 K3s 集群，提供了自包含的 quickstart overlay，内置 PostgreSQL、Redis 及全部服务组件，适配 K3s 默认 Traefik Ingress：
+
+```bash
+kubectl apply -k deploy/k3s/overlays/quickstart/
+```
+
+详细说明请参考 [`deploy/k3s/README_zh.md`](./deploy/k3s/README_zh.md)。
+
 ### 环境变量
 
 关键配置选项：