Admin: manual scoring for open-ended questions

database/migrations/2026_03_22_210217_add_score_to_answers_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('answers', function (Blueprint $table) {
+            $table->decimal('score', 8, 2)->nullable()->after('text_content');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('answers', function (Blueprint $table) {
+            $table->dropColumn('score');
+        });
+    }
+};