Add changelog for first alpha 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 follows a pre-release oriented variant of Semantic Versioning.
+
+## [v0.1.0-alpha.1] - 2026-06-25
+
+First public alpha release of BearWave for macOS.
+
+### Added
+
+- native macOS app built with SwiftUI and AVFoundation
+- Radio Browser integration for:
+  - Top
+  - Germany
+  - Netherlands
+  - World
+  - Search Results
+- favorites, recents, and manual stations
+- station folders for organizing saved stations
+- menu bar controls
+- mini player
+- station detail panel
+- explicit playback states:
+  - connecting
+  - buffering
+  - playing
+  - paused
+  - stopped
+  - failed
+- stream metadata display through `AVPlayerItemMetadataOutput`
+- station artwork and favicon caching
+- German and English localization
+- About panel with release version and custom BearWave artwork
+- repository metadata files:
+  - `README.md`
+  - `CHANGELOG.md`
+  - `LICENSE`
+  - `SECURITY.md`
+  - `CODE_OF_CONDUCT.md`
+
+### Changed
+
+- aligned the macOS project back to a radio-first product direction
+- reframed saved-station groups in the UI as folders
+- improved README structure for forge/repository presentation
+- set the visible app release version to `v0.1.0-alpha.1`
+
+### Removed
+
+- podcast support
+- podcast parser, views, models, store, and persistence paths
+- podcast-specific playback controls and progress logic
+
+### Notes
+
+- this release is currently unsigned
+- this release is not notarized
+- Gatekeeper may warn on first launch
+- current release artifact is intended for early testers