feat: Multi-user Gateway process isolation and configurable port

[RyanShu555]

Summary

This PR implements multi-user process isolation for the OpenClaw Gateway and adds configurable port support, resolving issues where one user's Gateway operations would interfere with another user's Gateway process on Windows multi-user systems.

Features

• Multi-user process isolation: Each user's Gateway writes its PID to %APPDATA%\clawx\gateway.pid for ownership tracking
  • Prevents User A's Gateway restart from killing User B's Gateway process
  • Detects orphaned processes via WebSocket connection test
  • Shows appropriate error messages when port is occupied by another user
• Configurable Gateway port: Users can now configure a custom port for the Gateway in Settings
  • Port configuration is persisted across restarts
  • findExistingGateway() correctly uses configured port instead of hardcoded default

Changes

• electron/gateway/manager.ts:
  • Added PID file management (writePidFile, readPidFile, clearPidFile, getPIdFilePath)
  • Added orphaned process detection (isLikelyOrphanedProcess)
  • Fixed findExistingGateway() to use this.status.port instead of hardcoded PORTS.OPENCLAW_GATEWAY
  • Removed premature clearPidFile() call from startProcess() (was breaking multi-user isolation)
• src/pages/Settings/index.tsx: Added Gateway port configuration UI
• src/i18n/locales/*/settings.json: Added translations for port settings

Testing

Tested on Windows with multiple user accounts:

• ✅ User A and User B can run Gateway independently on different ports
• ✅ Restart operations don't affect other users' Gateway processes
• ✅ Port conflicts show appropriate error messages

Merged Upstream Changes

This PR also includes the following upstream changes:

• IPC refactor (refactor IPC #341)
• Moonshot CN web search domain fix (Fix/moonshot cn web search domain #338)

Checklist

• Code follows project style guidelines
• Self-reviewed before submitting
• Tested on target platform (Windows)

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com