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/build/build.service.ts

@@ -297,8 +297,9 @@ export class BuildService {
 
   private nodeDockerfile(app: Application): string {
     const port = app.port || 3000;
+    const nodeVersion = app.runtimeVersion || '20';
     return `# --- Build stage ---
-FROM node:20-alpine AS builder
+FROM node:${nodeVersion}-alpine AS builder
 WORKDIR /app
 COPY package*.json ./
 RUN npm install --legacy-peer-deps && npm cache clean --force
@@ -330,7 +331,7 @@ RUN if ([ -f next.config.js ] || [ -f next.config.mjs ] || [ -f next.config.ts ]
 RUN npm run build 2>/dev/null || true
 
 # --- Production stage ---
-FROM node:20-alpine AS runner
+FROM node:${nodeVersion}-alpine AS runner
 WORKDIR /app
 RUN addgroup -g 1001 -S appgroup && adduser -S appuser -u 1001
 
@@ -360,6 +361,7 @@ CMD ["sh", "-c", "if [ \\"$(cat /app/.mode)\\" = \\"standalone\\" ] && [ -f serv
   }
 
   private laravelDockerfile(app: Application): string {
+    const phpVersion = app.phpVersion || '8.3';
     return `# --- Build stage ---
 FROM composer:2 AS composer
 WORKDIR /app
@@ -369,7 +371,7 @@ COPY . .
 RUN composer dump-autoload --optimize --no-dev
 
 # --- Production stage ---
-FROM php:8.3-fpm-alpine
+FROM php:${phpVersion}-fpm-alpine
 RUN apk add --no-cache nginx supervisor \\
     && docker-php-ext-install pdo pdo_mysql pdo_pgsql opcache
 
@@ -387,7 +389,9 @@ CMD ["/usr/bin/supervisord", "-c", "/etc/supervisord.conf"]
   }
 
   private wordpressDockerfile(app: Application): string {
-    return `FROM wordpress:6-php8.3-apache
+    const wpVersion = app.runtimeVersion || '6.7';
+    const phpVersion = app.phpVersion || '8.3';
+    return `FROM wordpress:${wpVersion}-php${phpVersion}-apache
 
 # Install additional PHP extensions commonly needed by WordPress
 RUN docker-php-ext-install opcache