feat(plugins): add livekit-plugins-rumik for Rumik AI TTS support

[Lothnic]

Description

This pull request introduces the new Rumik AI Text-to-Speech plugin (livekit-plugins-rumik) to support Rumik AI's muga and mulberry models.

Key Features

• REST & WebSocket Support: Supports standard chunked HTTP synthesize (returning mono audio/wav) and low-latency real-time WebSockets (streaming mono audio/pcm @ 24 kHz).
• Rich Configuration: Supports model steering via natural language description, preset speakers, pitch semitone shifts (f0_up_key), temperature, repetition penalty, etc.
• Compliance: Includes comprehensive unit tests in test_plugin_rumik_tts.py and is fully compliant with strict ruff and mypy check rules.

[devin-ai-integration]

Devin Review found 1 new potential issue.

[devin-ai-integration]

🟡 Unnecessary numpy dependency in Rumik plugin

The pyproject.toml for livekit-plugins-rumik declares numpy>=1.26 as a dependency, but numpy is never imported or used anywhere in the plugin's code. This adds a large, unnecessary transitive dependency for all users of the plugin. It's likely a copy-paste artifact from another plugin template.

Suggested change

	dependencies = ["livekit-agents[codecs]>=1.6.0", "numpy>=1.26"]
	dependencies = ["livekit-agents[codecs]>=1.6.0"]

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