feat: add blaze voicebot plugin

[HoangPN711]

No description provided.

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[devin-ai-integration]

Devin Review found 2 new potential issues.

View 11 additional findings in Devin Review.

[devin-ai-integration]

🔴 Environment variable name mismatch: BLAZE_API_TOKEN documented but BLAZE_AUTH_TOKEN is what pydantic-settings reads

The BlazeConfig class defines its auth field as auth_token and uses env_prefix = "BLAZE_" (_config.py:67). Pydantic-settings v2 constructs env var names as env_prefix + field_name, so it will look for BLAZE_AUTH_TOKEN. However, the README (README.md:30), the __init__.py module docstring (__init__.py:28), and the BlazeConfig class docstring (_config.py:22) all document the env var as BLAZE_API_TOKEN. Users following the documentation will set BLAZE_API_TOKEN, which will be silently ignored — the field will fall back to its default empty string "", causing authentication failures that are hard to diagnose.

Suggested change

	auth_token: str = Field(
	default="",
	description="Bearer token for API authentication",
	api_token: str = Field(
	default="",
	description="Bearer token for API authentication",
	)

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[devin-ai-integration]

🔴 Field rename auth_token → api_token must be propagated to all usages

If the field is renamed from auth_token to api_token (to fix BUG-0001), all references to self._config.auth_token and self._auth_token in the plugin code must be updated. These references exist in stt.py:103, tts.py:98, llm.py:94, and the update_options methods in all three files. Alternatively, if the field is kept as auth_token, the README, __init__.py docstring, and _config.py docstring must all be updated to say BLAZE_AUTH_TOKEN.

Prompt for agents

After renaming the field in _config.py from auth_token to api_token, update all references throughout the plugin:

1. In livekit-plugins/livekit-plugins-blaze/livekit/plugins/blaze/stt.py line 103: change self._config.auth_token to self._config.api_token
2. In livekit-plugins/livekit-plugins-blaze/livekit/plugins/blaze/tts.py line 98: change self._config.auth_token to self._config.api_token
3. In livekit-plugins/livekit-plugins-blaze/livekit/plugins/blaze/llm.py line 94: change self._config.auth_token to self._config.api_token

Also update the docstring in _config.py line 22 to say BLAZE_API_TOKEN (it already does, so just verify it stays correct after renaming).

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