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.

database/migrations/2026_04_02_000000_create_notes_table.php

@@ -0,0 +1,25 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('notes', function (Blueprint $table): void {
+            $table->id();
+            $table->string('title')->default('Untitled Note');
+            $table->json('content')->nullable();   // array of block objects
+            $table->string('color', 20)->default('#FFFFFF');
+            $table->boolean('is_pinned')->default(false);
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('notes');
+    }
+};