docs(character-dictionary): correct auth requirement and add portrait do

- AniList auth not required for character dictionary; uses public GraphQL
- Document nameMatchImagesEnabled and inline portrait behavior
- Clarify AniList auth is only for watch-progress sync
- Delete stale release/release-notes.md

changes/character-dictionary-docs.md

@@ -0,0 +1,6 @@
+type: docs
+area: character-dictionary
+
+- Corrected character dictionary setup docs: AniList authentication is not required; the feature uses public GraphQL queries and only needs `subtitleStyle.nameMatchEnabled`.
+- Added documentation for inline character portraits (`subtitleStyle.nameMatchImagesEnabled`).
+- Clarified that AniList authentication is only needed for watch-progress sync, not the character dictionary.