fix: Run container as root to fix react-router permission denied

- Change Dockerfile to run as root instead of peikarband user
- Update Helm values.yaml to use root user (runAsUser: 0, runAsNonRoot: false)
- Improve entrypoint.sh permission handling with reusable function
- Add reflex init before run if packages not installed
- Fix node_modules/.bin permissions for symlinks and targets

This resolves the 'react-router: Permission denied' error by running
containers with root privileges. TODO: Switch back to non-root user
after permission issues are fully resolved.

helm/peikarband/values.yaml

@@ -50,10 +50,12 @@ podAnnotations:
   prometheus.io/port: "8000"
   prometheus.io/path: "/metrics"
 
+# Running as root for now to avoid permission issues
+# TODO: Switch back to non-root user after permission issues are resolved
 podSecurityContext:
-  runAsNonRoot: true
-  runAsUser: 1000
-  fsGroup: 1000
+  runAsNonRoot: false
+  runAsUser: 0
+  fsGroup: 0
 
 securityContext:
   allowPrivilegeEscalation: false