feat: Kubernetes 자동 배포 파이프라인 구축

- Dockerfile: Expo web export → nginx multi-stage 빌드
- nginx.conf: SPA fallback, gzip, health endpoint
- K8s manifests: namespace, deployment (2 replicas), service, ingress
- Traefik IngressRoute (선택적) 포함
- Gitea Actions workflow: push 시 빌드→Gitea Registry push→rollout restart
- DEPLOY.md: 초기 설정 가이드 (kubeconfig, secrets, DNS)

Domain: insurance.junggomoa.com

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

deploy/nginx.conf

@@ -0,0 +1,44 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types
+        text/plain
+        text/css
+        text/javascript
+        text/xml
+        application/json
+        application/javascript
+        application/xml+rss
+        application/atom+xml
+        image/svg+xml;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+        expires 30d;
+        add_header Cache-Control "public, immutable";
+    }
+
+    location = /index.html {
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+    }
+
+    location = /health {
+        access_log off;
+        return 200 "ok\n";
+        add_header Content-Type text/plain;
+    }
+
+    error_page 500 502 503 504 /50x.html;
+    location = /50x.html {
+        root /usr/share/nginx/html;
+    }
+}