feat: tkpurchase 시스템 Phase 1 - 협력업체 마스터 + 당일 방문 관리

신규 독립 시스템 tkpurchase (구매/방문 관리) 구축:
- 협력업체 CRUD + 소속 작업자 관리 (마스터 데이터 소유)
- 당일 방문 등록/체크인/체크아웃 + 일괄 마감
- 업체 자동완성, CSV 내보내기, 집계 통계
- 자정 자동 체크아웃 (node-cron)
- tkuser 협력업체 읽기 전용 탭 + 권한 그리드(tkpurchase-perms) 추가
- docker-compose에 tkpurchase-api/web 서비스 추가

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tkpurchase/migrations/001_create_tables.sql

@@ -0,0 +1,75 @@
+-- tkpurchase Phase 1: 협력업체 + 방문 관리 테이블
+
+-- ① 협력업체
+CREATE TABLE IF NOT EXISTS partner_companies (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  company_name VARCHAR(200) NOT NULL,
+  business_number VARCHAR(20) UNIQUE,
+  representative VARCHAR(100),
+  contact_name VARCHAR(100),
+  contact_phone VARCHAR(20),
+  address VARCHAR(500),
+  business_type JSON,
+  insurance_number VARCHAR(30),
+  insurance_expiry DATE,
+  notes TEXT,
+  is_active BOOLEAN DEFAULT TRUE,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+);
+
+-- ② 협력업체 소속 작업자
+CREATE TABLE IF NOT EXISTS partner_workers (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  company_id INT NOT NULL,
+  worker_name VARCHAR(100) NOT NULL,
+  position VARCHAR(50),
+  is_team_leader BOOLEAN DEFAULT FALSE,
+  phone VARCHAR(20),
+  safety_training_date DATE,
+  notes TEXT,
+  is_active BOOLEAN DEFAULT TRUE,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  FOREIGN KEY (company_id) REFERENCES partner_companies(id)
+);
+
+-- ③ 당일 방문 기록
+CREATE TABLE IF NOT EXISTS daily_visits (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  visit_date DATE NOT NULL,
+  company_id INT,
+  company_name VARCHAR(200),
+  visitor_name VARCHAR(100) NOT NULL,
+  visitor_count INT DEFAULT 1,
+  purpose ENUM('day_labor','equipment_repair','inspection','delivery',
+               'safety_audit','client_audit','construction','other') NOT NULL,
+  purpose_detail VARCHAR(500),
+  workplace_name VARCHAR(200),
+  safety_education_yn BOOLEAN DEFAULT FALSE,
+  vehicle_number VARCHAR(20),
+  check_in_time DATETIME,
+  check_out_time DATETIME,
+  checkout_note VARCHAR(500),
+  notes TEXT,
+  status ENUM('checked_in','checked_out','auto_checkout','cancelled') DEFAULT 'checked_in',
+  managing_department VARCHAR(50),
+  registered_by INT NOT NULL,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  INDEX idx_visit_date (visit_date),
+  INDEX idx_company (company_id),
+  INDEX idx_status (status),
+  FOREIGN KEY (company_id) REFERENCES partner_companies(id) ON DELETE SET NULL
+);
+
+-- ④ 방문 건별 개별 인원 명단
+CREATE TABLE IF NOT EXISTS daily_visit_workers (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  daily_visit_id INT NOT NULL,
+  partner_worker_id INT,
+  worker_name VARCHAR(100) NOT NULL,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  FOREIGN KEY (daily_visit_id) REFERENCES daily_visits(id) ON DELETE CASCADE,
+  FOREIGN KEY (partner_worker_id) REFERENCES partner_workers(id) ON DELETE SET NULL
+);