Initial commit: nightly iOS app + Supabase backend

iOS SwiftUI app with Supabase auth/realtime, Node.js backend,
Docker/Supabase self-hosted infrastructure, and APNs scheduler.

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

backend/api/Dockerfile

@@ -0,0 +1,7 @@
+FROM node:22-alpine
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --omit=dev
+COPY src ./src
+EXPOSE 3000
+CMD ["node", "src/index.js"]