chore: create CHANGELOG.md for v0.3.0 release

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.3.0] - 2026-06-02
+
+### Added
+- **Zero-Config Setup:** Firelink now automatically bundles the `aria2c` engine and all of its dynamic library dependencies (OpenSSL, sqlite, libssh2, etc.) internally via `dylibbundler`. End-users no longer need to install Homebrew or `aria2c` manually! 
+- **In-App Update Checker:** A built-in update checker is now available inside the Settings About pane.
+- **Queue Management:** Advanced drag-and-drop priority ordering and queue management controls.
+- **Download Recovery:** Built-in download recovery and automated retry policies for unstable connections.
+
+### Changed
+- **README Redesign:** Modernized the README with a clean layout, a collapsible feature index, centered App Icon header, and updated roadmap.
+- **CI Releases:** The GitHub Actions DMG release pipeline now automatically fetches and packages dependencies during builds.
+
+## [0.2.1] - 2026-06-02
+### Changed
+- Fixed CI release runner specifying macOS 26.
+
+## [0.2.0] - 2026-06-01
+### Added
+- Initial core download engine with `aria2c` support.
+- Native macOS Settings pane.
+- Smart file categorization and organization based on extension detection.
+- Keychain-secured authentication integration.