Adds Volcengine, Volcengine Plan model provider support to Apus.

Distribution

• Package: @apus/volcengine-provider
• Install route: npm: @openclaw/volcengine-provider or ClawHub: clawhub:@openclaw/volcengine-provider

Surface

• Providers: volcengine, volcengine-plan
• Contracts: speechProviders

Related docs

• volcengine