refactor(launcher): split config parser and CLI builder

Decompose launcher/config.ts into focused domain parser and CLI normalization modules to reduce refactor risk while preserving command behavior. Align Jellyfin launcher config with session-based auth by dropping config token/userId dependency.

launcher/types.ts

@@ -121,8 +121,6 @@ export interface LauncherJellyfinConfig {
   enabled?: boolean;
   serverUrl?: string;
   username?: string;
-  accessToken?: string;
-  userId?: string;
   defaultLibraryId?: string;
   pullPictures?: boolean;
   iconCacheDir?: string;