Remove OpenClaw / Claw integration

[Simpleyyt]

Removes the OpenClaw (Claw) integration so AI Manus no longer ships a separate Claw service, APIs, or UI.

What was removed

• claw/ service (OpenClaw Gateway + manus-claw plugin and Docker image)
• Backend Claw domain/application/infrastructure, REST routes, /ws/claw, and the OpenAI-compatible LLM proxy used only by Claw containers
• Frontend Claw page, sidebar entry, API client, assets, and i18n keys
• Compose / CI / env wiring (CLAW_*, MANUS_API_BASE_URL, manus-claw image)
• Docs, README, AGENTS/CLAUDE, and the debug-claw skill

Notes

• MongoDB claws collection is no longer registered with Beanie; leftover documents are unused.
• Historical plan notes under docs/superpowers/plans/ still mention ClawPage as a past design step.
• CLAW_ENABLED already defaulted to false, so the default sidebar did not show Claw.

Testing

• Frontend: npm run test (92 passed) + type-check + lint (0 errors) + build (no Claw chunks in dist)
• Backend: compile/import check; 112 unit tests passed, including test_ws_final_agent_status.py against the trimmed WebSocket routes
• Compose YAML files parse; CI image matrix is frontend, backend, sandbox only