feat: add disable sign

[SenkjM]

for bin, ues --disable-sign flag to disable sign check.

for cf-worker, uesDISABLE_SIGN to disable sign check.

[Copilot]

Pull Request Overview

This PR adds functionality to disable signature verification in the openlist proxy for both Cloudflare Worker and Go binary implementations. The feature allows bypassing security checks for easier access while warning users about potential privacy implications.

• Adds configuration options to disable signature verification (DISABLE_SIGN for CF Worker, --disable-sign flag for Go binary)
• Modifies verification logic to skip signature checks when disabled
• Includes privacy warnings in multiple languages about security implications

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
openlist-proxy.js	Adds DISABLE_SIGN constant and conditional signature verification logic with privacy warnings
openlist-proxy.go	Adds disableSign flag and conditional signature verification in download handler

[xrgzs]

LGTM