feat(saas): full SquareMCP SaaS platform v1

- JWT auth with bcrypt password hashing, cookie sessions, forgot/reset password
- Per-user encrypted credential storage (Redis + AES-256-GCM) for all 9 platforms
- Usage tracking with monthly limits per plan (free/starter/growth/enterprise)
- Invoice generation and retrieval (admin + user views)
- Admin panel with customer listing (role-based access)
- Web app UI at app.squaremcp.com — login, dashboard, connections, usage, invoices
- Unified auth middleware: API key, OAuth Bearer, and JWT cookie support
- Facebook Graph API fixes: published_posts endpoint, photo/video post support
- TikTok sandbox compliance: SELF_ONLY privacy for unaudited apps
- URL verification files for TikTok app review

product/app/Dockerfile

@@ -0,0 +1,6 @@
+FROM nginx:1.27-alpine
+COPY product/app/nginx-app.conf /etc/nginx/conf.d/default.conf
+COPY product/app/index.html /usr/share/nginx/html/index.html
+COPY product/app/styles.css /usr/share/nginx/html/styles.css
+COPY product/app/app.js /usr/share/nginx/html/app.js
+EXPOSE 8080