feat: version selection for runtimes and databases

Backend:
- Add runtimeVersion, phpVersion, dbVersion columns to Application entity
- Add version fields to CreateApplicationDto with validation
- Node.js Dockerfile: use selected version (22/20/18/16) instead of hardcoded 20
- Laravel Dockerfile: use selected PHP version (8.4/8.3/8.2/8.1) instead of 8.3
- WordPress Dockerfile: use selected WP version (6.7/6.6/6.5/6.4) + PHP version
- K8s deployDatabase(): use selected DB version instead of hardcoded postgres:16/mysql:8.0
- K8s restoreDatabaseDump(): match DB image version for restore jobs
- Add dbVersion to ManifestContext interface

Frontend:
- Add runtimeVersion, phpVersion, dbVersion to Application and CreateApplicationDto
- Deploy page: Node.js version dropdown (22/20/18/16)
- Deploy page: Laravel PHP version dropdown (8.4/8.3/8.2/8.1)
- Deploy page: WordPress version + PHP version dropdowns
- Deploy page: PostgreSQL version dropdown (17/16/15/14)
- Deploy page: MySQL version dropdown (9.0/8.4/8.0/5.7)
- Deploy page: auto-set default versions on runtime/DB selection
- Review step: show selected versions
- App detail page: display runtime + DB versions in config and header

backend/src/kubernetes/kubernetes.service.ts

@@ -25,6 +25,7 @@ interface ManifestContext {
   subdomain: string;
   dbUsername: string;
   dbPassword: string;
+  dbVersion: string;
 }
 
 @Injectable()
@@ -97,6 +98,7 @@ export class KubernetesService implements OnModuleInit {
       subdomain: app.subdomain || app.name,
       dbUsername: app.dbUsername || 'appuser',
       dbPassword: app.dbPassword || this.generatePassword(),
+      dbVersion: app.dbVersion || '',
     };
 
     const manifests: Record<string, any> = {};
@@ -398,7 +400,9 @@ export class KubernetesService implements OnModuleInit {
 
     // Deploy database
     const isPostgres = ctx.databaseType === DatabaseType.POSTGRESQL;
-    const image = isPostgres ? 'postgres:16-alpine' : 'mysql:8.0';
+    const defaultDbVersion = isPostgres ? '16' : '8.0';
+    const dbVer = ctx.dbVersion || defaultDbVersion;
+    const image = isPostgres ? `postgres:${dbVer}-alpine` : `mysql:${dbVer}`;
     const port = isPostgres ? 5432 : 3306;
     const envVars = isPostgres
       ? [
@@ -902,7 +906,9 @@ export class KubernetesService implements OnModuleInit {
           `mysql -h ${dbName} -u "$DB_USER" -p"$DB_PASSWORD" ${dbDatabase} < /dump/dump.sql 2>&1`,
         ];
 
-    const image = isPostgres ? 'postgres:16-alpine' : 'mysql:8.0';
+    const defaultRestoreDbVer = isPostgres ? '16' : '8.0';
+    const restoreDbVer = app.dbVersion || defaultRestoreDbVer;
+    const image = isPostgres ? `postgres:${restoreDbVer}-alpine` : `mysql:${restoreDbVer}`;
 
     // 3. Create the restore Job
     const job: k8s.V1Job = {