dsh-api v0.1.0

First release with the SSE control-plane and standard dsh-plugin bundle layout.

• HTTP: GET /dsh-api/health, /language, /workspace/{list,current,create}, /companion/state
• HTTP: POST /dsh-api/language, /workspace/create, /workspace/open, /input/paste, /window/{show,reload}, /app/quit
• SSE: GET /dsh-api/events — agent-idle, approval-needed, heartbeat, server-stopping
• Install: dsh plugin --profile web add github:lilming123/dsh-api