Add multi-tier subscription system (Starter, Professional, Enterprise) with per-tier storage and bandwidth pricing, replace static free-tier limits with nullable usage-based fields in SubscriptionPlan model, introduce subscribe/unsubscribe API endpoints with plan validation, update invoice generator to calculate costs based on user's active plan tier, and refactor pricing page to load plans dynamically from backend API instead of hardcoded HTML.
Implement a full-featured admin backend at `/manage/` with login authentication using
signed cookies and constant-time credential verification. The panel includes a dashboard
showing total/active users, storage usage, monthly revenue, and pending invoices, plus
user management, payment overview, and pricing configuration pages. New environment
variables `ADMIN_USERNAME`, `ADMIN_PASSWORD`, `ADMIN_SESSION_SECRET`, and
`ADMIN_SESSION_EXPIRE_HOURS` control access. The admin router is registered in main.py
and all new templates, auth module, and router files are added.
Implement a mobile-friendly navigation system that replaces the static nav menu with a hamburger toggle button on screens ≤768px. The menu slides in from the left as a fixed overlay panel with smooth CSS transitions, and automatically closes when any nav link is clicked. Includes animated hamburger icon transformation (rotating top/bottom bars, hiding middle bar) and adjusted hero section padding for better mobile layout.
- Update `generate_legal_documents` default `template_dir` from `"templates/legal"` to `"mywebdav/templates/legal"`
- Update `Jinja2Templates` directory from `"templates"` to `"mywebdav/templates"`
- Add new `base.html` template with navigation, footer, and SEO meta tags
- Add new `features.html` template with responsive grid layout and feature cards
- Add new legal document templates: `compliance_statement.html`, `contact_complaint_mechanism.html`, `cookie_policy.html`, `data_portability_deletion_policy.html`