fix: cleanup k8s configs, add deploy.sh, remove hardcoded secrets

- Add one-click deploy script (k8s/deploy.sh) for test + prod
- Add startupProbe to backend (60x10s = 10min grace for ML model loading)
- Add configmap.yaml and secret.yaml (envsubst from backend/.env)
- Fix image URLs: add registry.plfai.cn prefix
- Fix frontend: API base URL relative (/api/v1), login-required mode
- Remove hardcoded localhost references from frontend
- Clean broken kustomize overlays
- Add nodeAffinity for backend→k8smaster, frontend→plf-cvm/k8smaster
- Remove dead ReplicaSets and stale pods during deploy

k8s/base/backend-deployment.yaml

@@ -19,7 +19,7 @@ spec:
     spec:
       containers:
         - name: backend
-          image: graphrag-backend:latest
+          image: registry.plfai.cn/graphrag-backend:latest
           imagePullPolicy: IfNotPresent
           ports:
             - containerPort: 8000
@@ -41,17 +41,25 @@ spec:
             limits:
               memory: "2Gi"
               cpu: "1000m"
+          startupProbe:
+            httpGet:
+              path: /api/v1/health
+              port: 8000
+            initialDelaySeconds: 30
+            periodSeconds: 10
+            failureThreshold: 60
           livenessProbe:
             httpGet:
               path: /api/v1/health
               port: 8000
-            initialDelaySeconds: 20
+            initialDelaySeconds: 0
             periodSeconds: 30
+            failureThreshold: 3
           readinessProbe:
             httpGet:
               path: /api/v1/health
               port: 8000
-            initialDelaySeconds: 10
+            initialDelaySeconds: 0
             periodSeconds: 10
       volumes:
         - name: backend-data