Fix issues with OpenClaw and MyClaw integrations

[Copilot]

Description

OpenClaw tests were failing due to missing node_modules and OPENCLAW_API_KEY absent from .env.example. MyClaw integration was entirely missing from the codebase.

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 📚 Documentation update
• 🧪 Test updates

Related Issue(s)

Changes Made

OpenClaw fixes:

• Added OPENCLAW_API_KEY to .env.example

MyClaw — new integration (src/myclaw.js):

• sendNotification(channel, message) — multi-channel alerts (email/SMS/push)
• sendPredictionAlert(prediction, channel) — formatted prediction notifications
• upsertWidget(widgetId, data) — create/update dashboard widgets (POST vs PUT based on widgetId)
• syncPredictionToDashboard(prediction, dashboardId) — push prediction data to a named dashboard
• Shared _request HTTP/HTTPS transport mirroring OpenClaw pattern

Wiring:

• src/index.js — exports MyClaw
• backend/src/models/Integration.js — 'myclaw' added to platform ENUM
• backend/src/controllers/integrationsController.js — MyClaw entry in getPlatforms and formatPredictionForPlatform
• INTEGRATIONS.md — MyClaw documented as section 7; supported export formats updated

Testing

• Unit tests pass
• Integration tests pass
• Manual testing completed
• No breaking changes

13 new tests in tests/myclaw.test.js cover constructor validation, all public methods, error handling, and non-JSON responses. All 73 root-level tests pass.

Screenshots (if applicable)

N/A

Checklist

• My code follows the code style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Additional Context

MyClaw follows the identical structural pattern as openclaw.js — same HTTP transport, same source/version headers, same error wrapping conventions.