feat(purchase): 카테고리 테이블 분리 + 동적 로드 + tkuser 관리

- DB: consumable_categories 테이블 생성, ENUM→VARCHAR 변환, 시드 4개
- API: GET/POST/PUT/DEACTIVATE /api/consumable-categories
- 프론트: 3개 JS 하드코딩 CAT_LABELS 제거 → API loadCategories() 동적 로드
- tkuser: 카테고리 관리 섹션 추가, select 옵션 동적 생성
- 별칭 시드 SQL (INSERT IGNORE 기반)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

system1-factory/api/db/migrations/20260401_category_table.sql

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+-- 소모품 카테고리 테이블 분리 (ENUM → 마스터 테이블)
+
+-- 1단계: 카테고리 마스터 테이블 생성
+CREATE TABLE IF NOT EXISTS consumable_categories (
+  category_id INT AUTO_INCREMENT PRIMARY KEY,
+  category_code VARCHAR(30) NOT NULL UNIQUE COMMENT '코드 (consumable, safety 등)',
+  category_name VARCHAR(50) NOT NULL COMMENT '표시명',
+  icon VARCHAR(30) DEFAULT 'fa-box' COMMENT 'Font Awesome 아이콘',
+  color_bg VARCHAR(30) DEFAULT '#dbeafe' COMMENT '배경색',
+  color_fg VARCHAR(30) DEFAULT '#1e40af' COMMENT '글자색',
+  sort_order INT DEFAULT 0,
+  is_active TINYINT(1) DEFAULT 1,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- 2단계: 기존 4개 시드
+INSERT IGNORE INTO consumable_categories (category_code, category_name, icon, color_bg, color_fg, sort_order) VALUES
+('consumable', '소모품', 'fa-box', '#dbeafe', '#1e40af', 1),
+('safety', '안전용품', 'fa-hard-hat', '#dcfce7', '#166534', 2),
+('repair', '수선비', 'fa-wrench', '#fef3c7', '#92400e', 3),
+('equipment', '설비', 'fa-cogs', '#f3e8ff', '#7e22ce', 4);
+
+-- 3단계: ENUM → VARCHAR 변환
+ALTER TABLE consumable_items MODIFY COLUMN category VARCHAR(30) DEFAULT 'consumable';
+ALTER TABLE purchase_requests MODIFY COLUMN custom_category VARCHAR(30) NULL;
+ALTER TABLE purchase_batches MODIFY COLUMN category VARCHAR(30) NULL;

system1-factory/api/db/migrations/20260401_seed_aliases.sql

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+-- 소모품 별칭 시드 데이터 (item_name LIKE 매칭, 데이터 없으면 무시)
+
+-- 장갑류
+INSERT IGNORE INTO item_aliases (item_id, alias_name)
+SELECT item_id, '장갑' FROM consumable_items WHERE item_name LIKE '%면장갑%';
+INSERT IGNORE INTO item_aliases (item_id, alias_name)
+SELECT item_id, '목장갑' FROM consumable_items WHERE item_name LIKE '%면장갑%';
+
+-- 테이프류
+INSERT IGNORE INTO item_aliases (item_id, alias_name)
+SELECT item_id, '테이프' FROM consumable_items WHERE item_name LIKE '%절연테이프%';
+INSERT IGNORE INTO item_aliases (item_id, alias_name)
+SELECT item_id, '전기테이프' FROM consumable_items WHERE item_name LIKE '%절연테이프%';
+
+-- 연마류
+INSERT IGNORE INTO item_aliases (item_id, alias_name)
+SELECT item_id, '사포' FROM consumable_items WHERE item_name LIKE '%연마지%' OR item_name LIKE '%연마석%';
+
+-- 마스크
+INSERT IGNORE INTO item_aliases (item_id, alias_name)
+SELECT item_id, '마스크' FROM consumable_items WHERE item_name LIKE '%방진마스크%' OR item_name LIKE '%방독마스크%';
+
+-- 안전화
+INSERT IGNORE INTO item_aliases (item_id, alias_name)
+SELECT item_id, '작업화' FROM consumable_items WHERE item_name LIKE '%안전화%';
+INSERT IGNORE INTO item_aliases (item_id, alias_name)
+SELECT item_id, '신발' FROM consumable_items WHERE item_name LIKE '%안전화%';