Initial commit — status checker service

Polls Nginx Proxy Manager API for proxy hosts matching configurable
domain patterns (NPM_INCLUDE_PATTERNS), HTTP-checks each every 60s,
serves results as JSON (/api/status) and a terminal-aesthetic HTML
page (/). Port 3035.

NPM connection and domain filter patterns are fully configurable via
environment variables — see README and .env.example.

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

Dockerfile

@@ -0,0 +1,14 @@
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+FROM node:22-alpine
+WORKDIR /app
+COPY package*.json ./
+RUN npm install --omit=dev
+COPY --from=build /app/dist ./dist
+EXPOSE 3035
+CMD ["node", "dist/index.js"]