Fixes #5216: Add VoiceVox MCP Server to Marketplace

[roomote]

Important

Add VoiceVox MCP Server to marketplace with local fallback support and comprehensive tests.

• Marketplace Data:
  • Add VoiceVox MCP Server to mcps.yaml with installation methods and prerequisites.
  • Update README.md to document the structure and details of the VoiceVox MCP Server.
• RemoteConfigLoader:
  • Add local fallback methods fetchLocalMcps() and fetchLocalModes() to load data from marketplace-data directory if remote fetch fails.
  • Update fetchModes() and fetchMcps() to use local fallbacks on failure.
• Tests:
  • Add voicevox-mcp.spec.ts to test loading of VoiceVox MCP Server, including tags, installation methods, prerequisites, and JSON configuration validation.

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[ellipsis-dev]

There's an inconsistency in the module naming. In the 'uvx (Recommended)' and 'Custom Configuration' sections, the command argument is 'mcp-server-voicevox', but in the 'pip install' section, it appears as 'mcp_server_voicevox'. Please confirm if this is intentional or if it should be standardized.

Suggested change

	"args": ["mcp-server-voicevox", "--voicevox-url=http://localhost:50021"]
	"args": ["mcp_server_voicevox", "--voicevox-url=http://localhost:50021"]