feat(tksupport): 전사 행정지원 서비스 신규 구축 (Phase 1 - 휴가신청)

sso_users 기반 전사 휴가신청/승인/잔여일 관리 서비스.
기존 tkfb의 workers 종속 휴가 기능을 전사 확장.

- API: Express + MariaDB, SSO JWT 인증, 자동 마이그레이션
- Web: 대시보드, 휴가 신청/현황/승인 페이지 (보라색 테마)
- DB: sp_vacation_requests, sp_vacation_balances 신규 테이블
- Docker: API(30600), Web(30680) 포트 구성

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

tksupport/api/db/migrations/001_create_sp_tables.sql

@@ -0,0 +1,42 @@
+-- sso_users에 입사일 추가
+ALTER TABLE sso_users ADD COLUMN IF NOT EXISTS hire_date DATE NULL COMMENT '입사일';
+
+-- 전사 휴가 신청
+CREATE TABLE IF NOT EXISTS sp_vacation_requests (
+  request_id INT AUTO_INCREMENT PRIMARY KEY,
+  user_id INT NOT NULL COMMENT 'sso_users.user_id',
+  vacation_type_id INT UNSIGNED NOT NULL,
+  start_date DATE NOT NULL,
+  end_date DATE NOT NULL,
+  days_used DECIMAL(4,1) NOT NULL,
+  reason TEXT,
+  status ENUM('pending','approved','rejected','cancelled') DEFAULT 'pending',
+  reviewed_by INT NULL,
+  reviewed_at TIMESTAMP NULL,
+  review_note TEXT,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  FOREIGN KEY (user_id) REFERENCES sso_users(user_id),
+  FOREIGN KEY (reviewed_by) REFERENCES sso_users(user_id),
+  FOREIGN KEY (vacation_type_id) REFERENCES vacation_types(id),
+  INDEX idx_user_status (user_id, status),
+  INDEX idx_dates (start_date, end_date)
+);
+
+-- 전사 휴가 잔여일
+CREATE TABLE IF NOT EXISTS sp_vacation_balances (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  user_id INT NOT NULL COMMENT 'sso_users.user_id',
+  vacation_type_id INT UNSIGNED NOT NULL,
+  year INT NOT NULL,
+  total_days DECIMAL(4,1) DEFAULT 0,
+  used_days DECIMAL(4,1) DEFAULT 0,
+  notes TEXT,
+  created_by INT NOT NULL,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+  UNIQUE KEY unique_user_type_year (user_id, vacation_type_id, year),
+  FOREIGN KEY (user_id) REFERENCES sso_users(user_id),
+  FOREIGN KEY (created_by) REFERENCES sso_users(user_id),
+  FOREIGN KEY (vacation_type_id) REFERENCES vacation_types(id)
+);