refactor: shared 모듈 추출 Phase 1~4 (notifyHelper, errors, logger, auth, dbPool)

Phase 1: notifyHelper.js → shared/utils/ (4개 서비스 중복 제거)
Phase 2: auth.js → shared/middleware/ (system1/system2 통합)
Phase 3: errors.js + logger.js → shared/utils/ (system1/system2 통합)
Phase 4: DB pool → shared/config/database.js (Group B 4개 서비스 통합)

- Docker 빌드 컨텍스트를 루트로 변경 (6개 API 서비스)
- 기존 파일은 re-export 패턴으로 consumer 변경 0개 유지
- .dockerignore 추가로 빌드 최적화

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

tksafety/api/Dockerfile

@@ -1,11 +1,20 @@
 FROM node:18-alpine
 WORKDIR /usr/src/app
-COPY package*.json ./
+
+# shared 모듈 복사
+COPY shared/ ./shared/
+
+COPY tksafety/api/package*.json ./
 RUN npm install --omit=dev
-COPY . .
+
+COPY tksafety/api/ ./
+
 RUN chown -R node:node /usr/src/app
 USER node
+
 EXPOSE 3000
+
 HEALTHCHECK --interval=30s --timeout=3s --start-period=20s --retries=3 \
   CMD node -e "require('http').get('http://localhost:3000/health', (res) => { process.exit(res.statusCode === 200 ? 0 : 1); })"
+
 CMD ["node", "index.js"]

tksafety/api/controllers/visitRequestController.js

@@ -1,5 +1,5 @@
 const visitRequestModel = require('../models/visitRequestModel');
-const notify = require('../utils/notifyHelper');
+const notify = require('../shared/utils/notifyHelper');
 
 // ==================== 출입 신청 관리 ====================
 

tksafety/api/middleware/auth.js

@@ -1,25 +1,8 @@
 const jwt = require('jsonwebtoken');
-const mysql = require('mysql2/promise');
+const { getPool } = require('../shared/config/database');
 
 const JWT_SECRET = process.env.SSO_JWT_SECRET;
 
-let pool;
-function getPool() {
-  if (!pool) {
-    pool = mysql.createPool({
-      host: process.env.DB_HOST || 'mariadb',
-      port: parseInt(process.env.DB_PORT) || 3306,
-      user: process.env.DB_USER || 'hyungi_user',
-      password: process.env.DB_PASSWORD,
-      database: process.env.DB_NAME || 'hyungi',
-      waitForConnections: true,
-      connectionLimit: 5,
-      queueLimit: 0
-    });
-  }
-  return pool;
-}
-
 function extractToken(req) {
   const authHeader = req.headers['authorization'];
   if (authHeader && authHeader.startsWith('Bearer ')) {

tksafety/api/models/dailyVisitModel.js

@@ -1,21 +1,4 @@
-const mysql = require('mysql2/promise');
-
-let pool;
-function getPool() {
-  if (!pool) {
-    pool = mysql.createPool({
-      host: process.env.DB_HOST || 'mariadb',
-      port: parseInt(process.env.DB_PORT) || 3306,
-      user: process.env.DB_USER || 'hyungi_user',
-      password: process.env.DB_PASSWORD,
-      database: process.env.DB_NAME || 'hyungi',
-      waitForConnections: true,
-      connectionLimit: 10,
-      queueLimit: 0
-    });
-  }
-  return pool;
-}
+const { getPool } = require('../shared/config/database');
 
 async function findToday() {
   const db = getPool();

tksafety/api/utils/notifyHelper.js

@@ -1,63 +0,0 @@
-// utils/notifyHelper.js — 공용 알림 헬퍼
-// system1-factory의 내부 알림 API를 통해 DB 저장 + Push 전송
-const http = require('http');
-
-const NOTIFY_URL = 'http://tkuser-api:3000/api/notifications/internal';
-const SERVICE_KEY = process.env.INTERNAL_SERVICE_KEY || '';
-
-const notifyHelper = {
-  /**
-   * 알림 전송
-   * @param {Object} opts
-   * @param {string} opts.type - 알림 유형 (safety, maintenance, repair, system)
-   * @param {string} opts.title - 알림 제목
-   * @param {string} [opts.message] - 알림 내용
-   * @param {string} [opts.link_url] - 클릭 시 이동 URL
-   * @param {string} [opts.reference_type] - 연관 테이블명
-   * @param {number} [opts.reference_id] - 연관 레코드 ID
-   * @param {number} [opts.created_by] - 생성자 user_id
-   */
-  async send(opts) {
-    try {
-      const body = JSON.stringify(opts);
-      const url = new URL(NOTIFY_URL);
-
-      return new Promise((resolve) => {
-        const req = http.request({
-          hostname: url.hostname,
-          port: url.port,
-          path: url.pathname,
-          method: 'POST',
-          headers: {
-            'Content-Type': 'application/json',
-            'X-Internal-Service-Key': SERVICE_KEY,
-            'Content-Length': Buffer.byteLength(body)
-          },
-          timeout: 5000
-        }, (res) => {
-          res.resume(); // drain
-          resolve(true);
-        });
-
-        req.on('error', (err) => {
-          console.error('[notifyHelper] 알림 전송 실패:', err.message);
-          resolve(false);
-        });
-
-        req.on('timeout', () => {
-          req.destroy();
-          console.error('[notifyHelper] 알림 전송 타임아웃');
-          resolve(false);
-        });
-
-        req.write(body);
-        req.end();
-      });
-    } catch (err) {
-      console.error('[notifyHelper] 알림 전송 오류:', err.message);
-      return false;
-    }
-  }
-};
-
-module.exports = notifyHelper;