dsh-live-talk v0.6.0

Original characters + bundled assets. Replaced all anime-derived character names/ids with original AI identities (林晚晴 / 顾清弦 / 秦未晞), renamed media files accordingly, and now ships avatars and opening videos in the npm/tarball package. UI adds a selected-character stage with opening video and emotion-clip playback. 75/75 tests passing.