ci: add woodpecker pipeline, Dockerfile and deploy configs

Mirrors the oneos- project layout: multi-stage node:22 → nginx:alpine
build, Woodpecker pipeline that tags images as <branch>-<pkg-version>
and pushes to harbor.lnh2e.com/lingniu-v1/bi, and a swarm-style
docker-compose for deployment.

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

nginx.conf

@@ -0,0 +1,17 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location /bi/ {
+        alias /usr/share/nginx/html/;
+        try_files $uri $uri/ /bi/index.html;
+    }
+
+    location /bi/assets/ {
+        alias /usr/share/nginx/html/assets/;
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}