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/Livewire/Project/Application/General.php

@@ -1000,4 +1000,23 @@ class General extends Component
             }
         }
     }
+
+    public function getDetectedPortInfoProperty(): ?array
+    {
+        $detectedPort = $this->application->detectPortFromEnvironment();
+
+        if (! $detectedPort) {
+            return null;
+        }
+
+        $portsExposesArray = $this->application->ports_exposes_array;
+        $isMatch = in_array($detectedPort, $portsExposesArray);
+        $isEmpty = empty($portsExposesArray);
+
+        return [
+            'port' => $detectedPort,
+            'matches' => $isMatch,
+            'isEmpty' => $isEmpty,
+        ];
+    }
 }