Add Kubernetes deployment manifests (#3025)

.gitignore

@@ -31,4 +31,7 @@ __pycache__
 /shell/preload/lang_env.sh
 
 .deepseek/
-.claude/
+.claude/
+
+# local Kubernetes overlays
+/deploy/kubernetes/overlays/local/

deploy/kubernetes/README.md

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+# Kubernetes deployment
+
+This deploys Qinglong as a single-replica `StatefulSet` with persistent data at `/ql/data`.
+
+```bash
+kubectl apply -k deploy/kubernetes/overlays/local
+kubectl -n qinglong rollout status statefulset/qinglong
+```
+
+Open the panel locally:
+
+```bash
+kubectl -n qinglong port-forward svc/qinglong 5700:5700
+```
+
+Then visit <http://127.0.0.1:5700>.
+
+## Image registry overlays
+
+Use `overlays/example` as the committed template for registry customization:
+
+```yaml
+whyour/qinglong:debian -> registry.example.com/whyour/qinglong:debian
+```
+
+Create `overlays/local/kustomization.yaml` for the actual cluster image. The `local` overlay is ignored by git so private registry names, digests, and credentials-related references stay local.
+
+## Storage
+
+The manifest creates a 5 GiB `ReadWriteOnce` PVC from the cluster's default `StorageClass`.
+If your cluster has no default storage class, add `storageClassName` under:
+
+```yaml
+volumeClaimTemplates:
+  - metadata:
+      name: data
+    spec:
+      storageClassName: your-storage-class
+```
+
+Keep `replicas: 1`. Qinglong stores state in the persistent data directory, including SQLite files, so multiple replicas should not share the same data volume.
+
+## Ingress example
+
+If you expose Qinglong through an Ingress path other than `/`, set `QlBaseUrl` to the same path with leading and trailing slashes.
+
+```yaml
+env:
+  - name: QlBaseUrl
+    value: "/qinglong/"
+```
+
+Example Ingress:
+
+```yaml
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: qinglong
+  namespace: qinglong
+spec:
+  rules:
+    - host: qinglong.example.com
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: qinglong
+                port:
+                  number: 5700
+```
+
+## Maintenance commands
+
+```bash
+kubectl -n qinglong logs -f statefulset/qinglong
+kubectl -n qinglong exec -it statefulset/qinglong -- ql check
+kubectl -n qinglong exec -it statefulset/qinglong -- ql update
+```

deploy/kubernetes/base/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - qinglong.yaml

deploy/kubernetes/base/qinglong.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: qinglong
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: qinglong
+  namespace: qinglong
+  labels:
+    app.kubernetes.io/name: qinglong
+spec:
+  type: ClusterIP
+  selector:
+    app.kubernetes.io/name: qinglong
+  ports:
+    - name: http
+      port: 5700
+      targetPort: http
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: qinglong
+  namespace: qinglong
+  labels:
+    app.kubernetes.io/name: qinglong
+spec:
+  serviceName: qinglong
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: qinglong
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: qinglong
+    spec:
+      securityContext:
+        fsGroup: 5432
+        fsGroupChangePolicy: OnRootMismatch
+      containers:
+        - name: qinglong
+          image: whyour/qinglong:debian
+          imagePullPolicy: IfNotPresent
+          env:
+            - name: QlBaseUrl
+              value: "/"
+            - name: TZ
+              value: Asia/Shanghai
+          ports:
+            - name: http
+              containerPort: 5700
+          readinessProbe:
+            httpGet:
+              path: /api/health
+              port: http
+            initialDelaySeconds: 20
+            periodSeconds: 10
+            timeoutSeconds: 3
+            failureThreshold: 6
+          livenessProbe:
+            httpGet:
+              path: /api/health
+              port: http
+            initialDelaySeconds: 60
+            periodSeconds: 20
+            timeoutSeconds: 3
+            failureThreshold: 6
+          startupProbe:
+            httpGet:
+              path: /api/health
+              port: http
+            periodSeconds: 5
+            timeoutSeconds: 3
+            failureThreshold: 60
+          resources:
+            requests:
+              cpu: 100m
+              memory: 256Mi
+            limits:
+              memory: 1Gi
+          volumeMounts:
+            - name: data
+              mountPath: /ql/data
+  volumeClaimTemplates:
+    - metadata:
+        name: data
+      spec:
+        accessModes:
+          - ReadWriteOnce
+        resources:
+          requests:
+            storage: 5Gi

deploy/kubernetes/overlays/example/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../base
+
+images:
+  - name: whyour/qinglong
+    newName: registry.example.com/whyour/qinglong
+    newTag: debian