feat:검사항목 frequency_n/c, standard_criteria 컬럼 추가

- frequency_n(측정횟수), frequency_c(합격판정기준) TINYINT 추가
- standard_criteria JSON 컬럼 추가 (구조화된 검사기준 비교용)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

database/migrations/2026_02_02_100000_add_frequency_nc_to_section_items.php

@@ -0,0 +1,23 @@
+<?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::table('document_template_section_items', function (Blueprint $table) {
+            $table->unsignedTinyInteger('frequency_n')->nullable()->after('measurement_type');
+            $table->unsignedTinyInteger('frequency_c')->nullable()->after('frequency_n');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('document_template_section_items', function (Blueprint $table) {
+            $table->dropColumn(['frequency_n', 'frequency_c']);
+        });
+    }
+};

database/migrations/2026_02_02_120000_add_standard_criteria_to_section_items.php

@@ -0,0 +1,22 @@
+<?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::table('document_template_section_items', function (Blueprint $table) {
+            $table->json('standard_criteria')->nullable()->after('tolerance');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('document_template_section_items', function (Blueprint $table) {
+            $table->dropColumn('standard_criteria');
+        });
+    }
+};