fix(k8s): correct Memos health check probe endpoints

- Change liveness and readiness probe paths from /api/v1/ping to /
- The /api/v1/ping endpoint was returning 404, causing CrashLoopBackOff
- Root path should be available for health checks in Memos

Fixes Memos deployment issues where pods were failing health checks

k8s/memos/memos-deployment.yaml

@@ -30,7 +30,7 @@ spec:
           mountPath: /var/opt/memos
         livenessProbe:
           httpGet:
-            path: /api/v1/ping
+            path: /
             port: http
           initialDelaySeconds: 30
           timeoutSeconds: 5
@@ -39,7 +39,7 @@ spec:
           failureThreshold: 3
         readinessProbe:
           httpGet:
-            path: /api/v1/ping
+            path: /
             port: http
           initialDelaySeconds: 10
           timeoutSeconds: 5