Initial commit: ym-dl with yandex-music-api-go library migration

Migrate ym-dl from custom oapi-codegen Yandex Music API client to external
gitea.mrixs.me/Mrixs/yandex-music-api-go library with token-only authentication.

Key changes:
- Replace custom Yandex API client with yandexmusic library wrapper
- Token-based OAuth authentication only (no username/password fallback)
- SQLite storage index with JSON index migration path
- Extended ID3 tag support: genre, comment, lyrics, publisher, ISRC, copyright
- High-resolution album covers (1000x1000)
- Fixed album download check (requires all tracks, not just one)

config.yaml.example

@@ -0,0 +1,22 @@
+# Yandex Music Downloader Configuration
+# Copy to config.yaml and fill in your values
+
+yandex:
+  # Option 1: OAuth token (preferred)
+  token: ""
+  # Option 2: Username/password for token exchange (not all accounts support this)
+  username: ""
+  password: ""
+
+artists:
+  - id: 12345    # Example artist ID - replace with actual Yandex Music artist IDs
+  - id: 67890
+
+storage:
+  path: "/data/music"     # Local path for downloads
+  organize: true          # Organize into Artist/Album/Track structure
+
+monitor:
+  interval: "24h"         # Check interval (duration string: 1h, 24h, 7d, etc.)
+
+debug: false              # Enable debug logging (HTTP requests/responses)