Refactor to remove slices and environments, replace with instances.

app/Http/Controllers/InstanceController.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Actions\Applications\CreateInstance;
+use App\Models\Application;
+use App\Models\Server;
+use Illuminate\Http\Request;
+
+class InstanceController extends Controller
+{
+    public function store(Request $request, Application $application)
+    {
+        $validated = $request->validate([
+            'server_id' => 'required|exists:servers,id',
+            'branch' => 'required|string|max:255',
+            'config' => 'sometimes|array',
+        ]);
+
+        $server = Server::findOrFail($validated['server_id']);
+        
+        $instance = (new CreateInstance())->execute(
+            $application,
+            $server,
+            $validated['branch'],
+            $validated['config'] ?? []
+        );
+
+        return redirect()
+            ->route('applications.show', [
+                'organisation' => $application->organisation_id,
+                'application' => $application->id
+            ])
+            ->with('success', 'Instance created successfully');
+    }
+}