feat: Bump version to 1.1.0, add CHANGELOG.md, and implement concurrency support with enhanced session management.

CHANGELOG.md

@@ -0,0 +1,20 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.1.0] - 2026-01-31
+
+### Added
+- **Concurrency Support**: Implemented a per-request architecture where `MovieBoxAPI` and `SessionManager` are instantiated for each request. This isolates user sessions and prevents race conditions under high load.
+- **Enhanced /download Endpoint**: The `/download` endpoint now mirrors the logic of `/sources`, including session warm-up and reliable resource retrieval for both Movies and Series.
+- **Session Warm-up**: Implemented automatic scraping of the content detail page to capture necessary session cookies and `uid` before making API calls.
+- **UID Propagation**: The `uid` is now correctly extracted and sent with all `/play` and `/download` requests, ensuring authorization.
+
+### Fixed
+- **Empty Results**: Fixed an issue where `/sources` and `/download` returned empty arrays due to missing session data and incorrect headers.
+- **Series Playback**: Resolved specific issues with Series content by standardizing the `Referer` path to `/movies/` (which is used by the upstream source for all content types).
+- **API Stability**: Fixed "unresponsiveness" and cross-user session pollution by removing Singleton antipatterns.
+
+### Changed
+- **Documentation**: Updated `API.md` and `README.md` to reflect the new architecture and endpoint requirements (removed `detailPath` from `/download` params).
+- **Architecture**: Refactored `api.js` and `session.js` to export Classes instead of singletons.