Three targeted fixes from user-reported issues:
1. STT config resolution (transcription_tools.py):
_has_openai_audio_backend() and _resolve_openai_audio_client_config()
now check stt.openai.api_key/base_url in config.yaml FIRST, before
falling back to env vars. Fixes voice transcription breaking when
using a custom OpenAI-compatible endpoint via config.yaml.
2. Stream consumer flood control fallback (stream_consumer.py):
When an edit fails mid-stream (e.g., Telegram flood control returns
failure for waits >5s), reset _already_sent to False so the normal
final send path delivers the complete response. Previously, a
truncated partial was left as the final message.
3. Telegram edit_message comment alignment (telegram.py):
Clarify that long flood waits return failure so streaming can fall
back to a normal final send.
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