feat: 구매/안전 시스템 전면 개편 — tkpurchase 개편 + tksafety 신규 + 권한 보강

Phase 1: tkuser 협력업체 CRUD 이관 (읽기전용 → 전체 CRUD)
Phase 2: tkpurchase 개편 — 일용공 신청/확정, 작업일정, 업무현황, 계정관리, 협력업체 포털
Phase 3: tksafety 신규 시스템 — 방문관리 + 안전교육 신고
Phase 4: SSO 인증 보강 (partner_company_id JWT, 만료일 체크), 권한 테이블 기반 접근 제어

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

tksafety/web/nginx.conf

@@ -0,0 +1,45 @@
+server {
+    listen 80;
+    server_name _;
+    charset utf-8;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_types text/plain text/css application/javascript application/json;
+    gzip_min_length 1024;
+
+    location ~* \.html$ {
+        expires -1;
+        add_header Cache-Control "no-store, no-cache, must-revalidate";
+    }
+
+    location ~* \.(js|css)$ {
+        expires 1h;
+        add_header Cache-Control "public, no-transform";
+    }
+
+    location /api/ {
+        proxy_pass http://tksafety-api:3000/api/;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /static/ {
+        expires 1h;
+        add_header Cache-Control "public, no-transform";
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location /health {
+        access_log off;
+        return 200 'ok';
+        add_header Content-Type text/plain;
+    }
+}