Fix fs.constants import in global config permission check

[Copilot]

The global config update permission check was accessing fs.constants from the fs/promises import, which doesn't expose constants in TypeScript types, causing a TypeError at runtime.

Changes:

• Import constants from 'fs' module separately
• Update permission check to use imported constants.W_OK instead of fs.constants.W_OK

// Before
import fs from "fs/promises"
await fs.access(Global.Path.config, fs.constants.W_OK)  // TypeError

// After
import fs from "fs/promises"
import { constants } from "fs"
await fs.access(Global.Path.config, constants.W_OK)  // Works correctly

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