chore(opencloud): Remove external OpenLDAP deployment

OpenCloud has been migrated to use the built-in IDM service which
provides an internal LDAP server (localhost:9236). The external
OpenLDAP deployment is no longer needed.

Changes:
- Remove openldap-deployment.yaml and related configuration files
- Remove openldap-admin-sealed.yaml (admin credentials)
- Remove ldap-init-structure.ldif (initialization script)
- Remove opencloud-ldap-schema files (schema configuration)
- Remove OPENLDAP_DEPLOYMENT.md documentation
- Remove OPENLDAP_ADMIN_PASSWORD env var from OpenCloud deployment

The OpenCloud deployment now relies solely on the built-in IDM
service for user and group storage via its internal LDAP interface.

Resolves: DEV-421

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/opencloud/opencloud-deployment.yaml

@@ -290,13 +290,6 @@ spec:
               name: opencloud-config-secrets
               key: ldap-bind-password
 
-        # External OpenLDAP admin password (for user/group storage)
-        - name: OPENLDAP_ADMIN_PASSWORD
-          valueFrom:
-            secretKeyRef:
-              name: openldap-admin-secret
-              key: admin-password
-
         # IDM service user passwords
         - name: OC_IDM_ADMIN_PASSWORD
           valueFrom:

apps/stalwart/stalwart-fresh-deployment.yaml

@@ -139,25 +139,37 @@ spec:
             memory: "2Gi"
             cpu: "2000m"
         startupProbe:
-          httpGet:
-            path: /healthz/live
-            port: 8080
+          exec:
+            command:
+            - curl
+            - -f
+            - --max-time
+            - "3"
+            - http://localhost:8080/healthz/live
           initialDelaySeconds: 60
           periodSeconds: 10
           timeoutSeconds: 5
           failureThreshold: 6
         livenessProbe:
-          httpGet:
-            path: /healthz/live
-            port: 8080
+          exec:
+            command:
+            - curl
+            - -f
+            - --max-time
+            - "3"
+            - http://localhost:8080/healthz/live
           initialDelaySeconds: 30
           periodSeconds: 10
           timeoutSeconds: 5
           failureThreshold: 3
         readinessProbe:
-          httpGet:
-            path: /healthz/ready
-            port: 8080
+          exec:
+            command:
+            - curl
+            - -f
+            - --max-time
+            - "3"
+            - http://localhost:8080/healthz/ready
           initialDelaySeconds: 10
           periodSeconds: 5
           timeoutSeconds: 3