fix(proxy): add validation and normalization for database proxy timeout

- Extract proxy timeout configuration logic into dedicated method
- Add min:1 validation rule for publicPortTimeout
- Normalize invalid timeout values (null, 0, negative) to default 3600s
- Add tests for timeout configuration normalization and validation

app/Livewire/Project/Service/Index.php

@@ -92,7 +92,7 @@ class Index extends Component
         'image' => 'required',
         'excludeFromStatus' => 'required|boolean',
         'publicPort' => 'nullable|integer',
-        'publicPortTimeout' => 'nullable|integer',
+        'publicPortTimeout' => 'nullable|integer|min:1',
         'isPublic' => 'required|boolean',
         'isLogDrainEnabled' => 'required|boolean',
         // Application-specific rules