fix(gateway): remove --dev flag from gateway startup args

[hazeone]

Summary

• Remove --dev flag from gateway startup args in GatewayManager.startProcess()
• The --dev flag caused OpenClaw gateway to run ensureDevGatewayConfig() on first startup, which wrote agents.list: [{ id: "dev", default: true }] with a C3-PO identity to ~/.openclaw/openclaw.json
• This made all packaged builds permanently default to the dev workspace (~/.openclaw/workspace-dev) instead of the standard "main" agent workspace

Root cause

manager.ts:571 always passed --dev in gatewayArgs:

['gateway', '--port', ..., '--token', ..., '--dev', '--allow-unconfigured']

OpenClaw's gateway subcommand treats --dev as a convenience flag that auto-creates a dev config + workspace (with agent id "dev", identity "C3-PO"). This is intended for OpenClaw CLI development, not for production ClawX usage.

Test plan

• Start ClawX with a clean ~/.openclaw/ directory, verify no agents.list with id: "dev" is created
• Verify gateway still starts successfully with --allow-unconfigured
• Verify provider/channel config written by ClawX is properly picked up by the gateway

Note for existing users: After this fix, users who already have the stale agents.list[0].id = "dev" in their ~/.openclaw/openclaw.json will need to manually remove the agents.list entry (or delete the config file to regenerate).

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