feat: add tagging functionality

to entries model and related migrations

database/migrations/2026_01_08_130657_create_tag_tables.php

@@ -0,0 +1,36 @@
+<?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('tags', function (Blueprint $table) {
+            $table->id();
+
+            $table->json('name');
+            $table->json('slug');
+            $table->string('type')->nullable();
+            $table->integer('order_column')->nullable();
+
+            $table->timestamps();
+        });
+
+        Schema::create('taggables', function (Blueprint $table) {
+            $table->foreignId('tag_id')->constrained()->cascadeOnDelete();
+
+            $table->morphs('taggable');
+
+            $table->unique(['tag_id', 'taggable_id', 'taggable_type']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('taggables');
+        Schema::dropIfExists('tags');
+    }
+};