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/Models/Note.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Note extends Model
+{
+    protected $fillable = [
+        'title',
+        'content',
+        'color',
+        'is_pinned',
+    ];
+
+    protected $casts = [
+        'content'   => 'array',
+        'is_pinned' => 'boolean',
+    ];
+}