v3.0.0 — talkies migration

Removes in-repo talkies/, asr-canary/, vllm/, qwen3-cuda-tts/ source
trees. Switches transcription + TTS to external psyb0t/talkies image
(pinned to v0.5.0 / v0.5.0-cuda). One container exposes both
/v1/audio/transcriptions and /v1/audio/speech (Kokoro + Qwen3-TTS).

Breaking: env-var renames (SPEACHES / ASR_CANARY / VLLM_CUDA /
QWEN_TTS_CUDA → TALKIES / TALKIES_CUDA), alias renames (local-speaches-*,
local-asr-canary-*, local-vllm-cuda-*, local-qwen3-cuda-tts → local-talkies-*
family), data directory consolidated to .data/talkies/,
distil-whisper-large-v3 dropped (use whisper-large-v3-turbo).

See CHANGELOG.md for the full migration matrix.