feat: add comprehensive environment variable parsing with nested resolution and hardcoded variable detection

This commit introduces advanced environment variable handling capabilities including:
- Nested environment variable resolution with circular dependency detection
- Extraction of hardcoded environment variables from docker-compose.yml
- New ShowHardcoded Livewire component for displaying detected variables
- Enhanced UI for better environment variable management

The changes improve the user experience by automatically detecting and displaying
environment variables that are hardcoded in docker-compose files, allowing users
to override them if needed. The nested variable resolution ensures complex variable
dependencies are properly handled.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/Livewire/Project/Shared/EnvironmentVariable/ShowHardcoded.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Livewire\Project\Shared\EnvironmentVariable;
+
+use Livewire\Component;
+
+class ShowHardcoded extends Component
+{
+    public array $env;
+
+    public string $key;
+
+    public ?string $value = null;
+
+    public ?string $comment = null;
+
+    public ?string $serviceName = null;
+
+    public function mount()
+    {
+        $this->key = $this->env['key'];
+        $this->value = $this->env['value'] ?? null;
+        $this->comment = $this->env['comment'] ?? null;
+        $this->serviceName = $this->env['service_name'] ?? null;
+    }
+
+    public function render()
+    {
+        return view('livewire.project.shared.environment-variable.show-hardcoded');
+    }
+}