fix: reliable source upload, build cancel, WordPress port 80 default

- Replace port-forward/netcat PVC upload with kubectl cp for integrity
- Add build cancellation API and session cleanup; deploy catches cancel
- Default port 80 for WordPress, PHP, and Laravel on create
- Build progress modal with cancel; Helm/K8s adjustments for deployments
- Update build and kubernetes specs

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

backend/src/build/build.service.spec.ts

@@ -402,28 +402,20 @@ describe('Helper pod PVC race condition', () => {
 });
 
 describe('WordPress entrypoint script', () => {
-  // The generated entrypoint script content
   const entrypointScript = `#!/bin/bash
 set -e
 
-# Merge user wp-content into PVC (first run only)
-if [ -d /usr/src/wordpress-user/wp-content ] && [ ! -f /var/www/html/wp-content/.user-content-merged ]; then
+# Merge user wp-content into PVC
+if [ -d /usr/src/wordpress-user/wp-content ]; then
+  mkdir -p /var/www/html/wp-content
   cp -a /usr/src/wordpress-user/wp-content/. /var/www/html/wp-content/
-  touch /var/www/html/wp-content/.user-content-merged
   chown -R www-data:www-data /var/www/html/wp-content
 fi
 
-# Apply user wp-config.php if docker-entrypoint has not created one yet
-if [ -f /usr/src/wordpress-user/wp-config.php ] && [ ! -f /var/www/html/wp-config.php ]; then
-  cp /usr/src/wordpress-user/wp-config.php /var/www/html/wp-config.php
-  chown www-data:www-data /var/www/html/wp-config.php
-fi
-
 exec docker-entrypoint.sh apache2-foreground`;
 
   it('should call docker-entrypoint.sh exactly once (via exec)', () => {
     const matches = entrypointScript.match(/docker-entrypoint\.sh/g);
-    // Should appear only once — in the final exec line
     expect(matches).toHaveLength(1);
   });
 
@@ -431,12 +423,13 @@ exec docker-entrypoint.sh apache2-foreground`;
     expect(entrypointScript).toContain('exec docker-entrypoint.sh apache2-foreground');
   });
 
-  it('should merge wp-content only on first run', () => {
-    expect(entrypointScript).toContain('.user-content-merged');
+  it('should merge wp-content on every start when staged content exists', () => {
+    expect(entrypointScript).toContain('/usr/src/wordpress-user/wp-content');
+    expect(entrypointScript).not.toContain('.user-content-merged');
   });
 
-  it('should only apply user wp-config.php if no config exists', () => {
-    expect(entrypointScript).toContain('! -f /var/www/html/wp-config.php');
+  it('should not copy user wp-config.php (credentials come from env vars)', () => {
+    expect(entrypointScript).not.toContain('wp-config.php');
   });
 
   it('should set proper ownership after merging wp-content', () => {