[P3] Feature flags #27
Description
Problem
The phased roadmap (AniList OAuth, notifications, PWA) needs a way to ship features behind flags for safe rollout.
Requirements
- Implement a simple feature flag system (config-based or a service like Unleash)
- Backend: flag check on endpoint registration or middleware
- Frontend: flag service that hides/shows UI sections
- Flags configurable per environment (dev vs staging vs prod)
Acceptance Criteria
- New features can be gated behind a flag
- Flags are configurable without code changes (env vars or config file)
- Frontend and backend can independently check flags
- Flags are documented in a central location
References
- Roadmap §13 — Operational Tooling