feat(freeradius): enable sqlippool for centralized IP allocation

- Add sqlippool module configuration
- Integrate sqlippool into authorize, post-auth, and accounting sections
- Add radippool table schema (InnoDB)
- Update Helm ConfigMap and Deployment templates
- Enable centralized IP management for OpenVPN cluster
- Bump Helm chart version to 1.0.12

templates/Deployment.yaml

@@ -280,6 +280,9 @@ spec:
             - name: freeradius-mods
               mountPath: /etc/freeradius/mods-enabled/dynamic_clients
               subPath: dynamic_clients
+            - name: freeradius-mods
+              mountPath: /etc/freeradius/mods-enabled/sqlippool
+              subPath: sqlippool              
             - name: freeradius-mods-config
               mountPath: /etc/freeradius/mods-config/sql/main/mysql/queries.conf
               subPath: queries.conf