feat: add notes management feature with CRUD operations

- Created Note model and controller for handling notes.
- Added routes for notes CRUD operations.
- Implemented notes index view with search and pinning functionality.
- Created migration for notes table with necessary fields.
- Developed event creation form with client and contract options.

app/Http/Controllers/NoteController.php

@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers;
+
+use App\Models\Note;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\View\View;
+
+class NoteController extends Controller
+{
+    public function index(): View
+    {
+        $notes = Note::orderByDesc('is_pinned')
+            ->orderByDesc('updated_at')
+            ->get();
+
+        return view('notes.index', compact('notes'));
+    }
+
+    public function store(Request $request): JsonResponse
+    {
+        $data = $request->validate([
+            'title'     => 'required|string|max:255',
+            'content'   => 'nullable|array',
+            'color'     => 'nullable|string|max:20',
+            'is_pinned' => 'boolean',
+        ]);
+
+        $note = Note::create($data);
+
+        return response()->json($note, 201);
+    }
+
+    public function update(Request $request, Note $note): JsonResponse
+    {
+        $data = $request->validate([
+            'title'     => 'required|string|max:255',
+            'content'   => 'nullable|array',
+            'color'     => 'nullable|string|max:20',
+            'is_pinned' => 'boolean',
+        ]);
+
+        $note->update($data);
+
+        return response()->json($note);
+    }
+
+    public function destroy(Note $note): JsonResponse
+    {
+        $note->delete();
+
+        return response()->json(['ok' => true]);
+    }
+
+    public function togglePin(Note $note): JsonResponse
+    {
+        $note->update(['is_pinned' => ! $note->is_pinned]);
+
+        return response()->json($note);
+    }
+}