feat: add OpenClaw profile settings and send flow

[Vincentwei1021]

Summary

• add OpenClaw profile CRUD endpoints and a secure manual send-to-OpenClaw flow
• add a Settings > OpenClaw configuration page and a Send to OpenClaw dialog in audio detail
• avoid returning stored SSH keys and hook keys from profile read APIs

Testing

• go test ./internal/service -run TestOpenClaw
• go test ./tests -run "Test(APIHandlerTestSuite/TestOpenClaw|APIHandlerTestSuite/TestSendTranscriptionToOpenClaw|DatabaseTestSuite/TestOpenClawProfileCRUD|SecurityTestSuite/TestOpenClawEndpointsUnauthorized|CLIHandlerTestSuite)"
• npm run type-check
• npm run lint -- --quiet