feat: add automated PORT environment variable detection and UI warnings

Add detection system for PORT environment variable to help users configure applications correctly:

- Add detectPortFromEnvironment() method to Application model to detect PORT env var
- Add getDetectedPortInfoProperty() computed property in General Livewire component
- Display contextual info banners in UI when PORT is detected:
  - Warning when PORT exists but ports_exposes is empty
  - Warning when PORT doesn't match ports_exposes configuration
  - Info message when PORT matches ports_exposes
- Add deployment logging to warn about PORT/ports_exposes mismatches
- Include comprehensive unit tests for port detection logic

The ports_exposes field remains authoritative for proxy configuration, while
PORT detection provides helpful suggestions to users.

app/Jobs/ApplicationDeploymentJob.php

@@ -1146,6 +1146,15 @@ class ApplicationDeploymentJob implements ShouldBeEncrypted, ShouldQueue
             foreach ($runtime_environment_variables as $env) {
                 $envs->push($env->key.'='.$env->real_value);
             }
+
+            // Check for PORT environment variable mismatch with ports_exposes
+            if ($this->build_pack !== 'dockercompose') {
+                $detectedPort = $this->application->detectPortFromEnvironment(false);
+                if ($detectedPort && ! empty($ports) && ! in_array($detectedPort, $ports)) {
+                    ray()->orange("PORT environment variable ({$detectedPort}) does not match configured ports_exposes: ".implode(',', $ports));
+                }
+            }
+
             // Add PORT if not exists, use the first port as default
             if ($this->build_pack !== 'dockercompose') {
                 if ($this->application->environment_variables->where('key', 'PORT')->isEmpty()) {