Add initial Restreamer implementation for YouTube-to-Jellyfin live restreaming

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented in this file.
+
+## [0.1.0] - Unreleased
+
+### Added
+
+- Initial implementation: yt-dlp based resolver (merging separate video/audio renditions when YouTube serves a live
+  stream split that way), ffmpeg restreaming, per-channel supervisor worker with proactive URL-expiry refresh and
+  reactive restart-with-backoff, broadcast fan-out to multiple HTTP clients, aiohttp server exposing an M3U playlist
+  and per-channel MPEG-TS streams for Jellyfin Live TV.
+- Docker Compose deployment (`Dockerfile`, `docker-compose.yml`) and configuration templates
+  (`channels.example.yaml`, `.env.example`).
+- Unit test suite covering config parsing, URL expiry parsing, ffmpeg argument building, playlist generation, and
+  broadcast fan-out.