fix: upgrade PHP 8.3 → 8.4 in Dockerfile for Laravel 13 compatibility

Laravel 13's Symfony dependencies require PHP >= 8.4.1. The container was
crash-looping because the entrypoint hit Composer's platform check against
the 8.3 runtime.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -39,7 +39,7 @@ COPY . .
 RUN composer dump-autoload --optimize --no-dev
 
 # Stage 3: Production image
-FROM php:8.3-fpm-alpine
+FROM php:8.4-fpm-alpine
 
 # System dependencies
 RUN apk add --no-cache \

composer.json

@@ -6,7 +6,7 @@
     "keywords": ["laravel", "framework"],
     "license": "MIT",
     "require": {
-        "php": "^8.3",
+        "php": "^8.4",
         "laravel/framework": "^13.8",
         "laravel/tinker": "^3.0",
         "livewire/livewire": "^4.3"