fix(laravel): apply runtime DB config and startup entrypoint

Laravel images no longer bake config:cache at build time, which ignored
K8s DB env vars. Add DB_CONNECTION, clear config on boot, generate APP_KEY
when missing, run migrations, and rebuild caches at container start.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/helm/cloudhost-app/templates/_helpers.tpl

@@ -90,6 +90,25 @@ PostgreSQL PGDATA path — must be a subdirectory of the mount to avoid "initdb:
 /var/lib/postgresql/data/pgdata
 {{- end }}
 
+{{- define "cloudhost-app.laravelDbConnection" -}}
+{{- if eq .Values.database.type "postgresql" }}pgsql{{- else if eq .Values.database.type "mongodb" }}mongodb{{- else }}mysql{{- end }}
+{{- end }}
+
+{{/*
+Laravel-specific DB env vars (DB_CONNECTION, DB_DATABASE, DB_USERNAME)
+*/}}
+{{- define "cloudhost-app.laravelDbEnv" -}}
+            - name: DB_CONNECTION
+              value: {{ include "cloudhost-app.laravelDbConnection" . | quote }}
+            - name: DB_DATABASE
+              value: {{ include "cloudhost-app.dbName" . }}
+            - name: DB_USERNAME
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "cloudhost-app.name" . }}-db-secret
+                  key: username
+{{- end }}
+
 {{/*
 App storage mount path based on runtime
 */}}