feat(config/m7-363): branding config field + defaults

config.example.yaml

@@ -38,6 +38,15 @@ library:
   # Kick off a scan on server startup. Env: SMARTMUSIC_LIBRARY_SCAN_ON_STARTUP
   scan_on_startup: false
 
+# Per-instance branding. Operators can rename their instance ("Family
+# Jukebox", "Office Music", etc.) and override the OG share-preview
+# description. Both fields default to sensible Minstrel values when
+# unset; you only need this section to override.
+# Env: SMARTMUSIC_BRANDING_APP_NAME, SMARTMUSIC_BRANDING_DESCRIPTION
+branding:
+  app_name: "Minstrel"
+  description: "Self-hosted music server with Subsonic compatibility, smart shuffle, and Lidarr integration."
+
 subsonic:
   # Gate for the legacy `p=` plaintext password parameter on /rest/*.
   # Leave disabled unless a specific client requires it — Minstrel prefers