feat: add protocol-specific domain allowlisting (http/https)

[Copilot]

Adds ability to restrict domains to HTTP-only or HTTPS-only traffic, rather than allowing both by default.

Usage

# HTTPS only
--allow-domains 'https://secure.example.com'

# HTTP only  
--allow-domains 'http://legacy-api.example.com'

# Both (default, backward compatible)
--allow-domains 'example.com'

# Mixed
--allow-domains 'example.com,https://secure.example.com,http://legacy.example.com'

Works with wildcards: https://*.secure.example.com

Changes

• src/domain-patterns.ts: Added parseDomainWithProtocol() and updated types (DomainProtocol, PlainDomainEntry, DomainPattern) to carry protocol info through the parsing pipeline
• src/squid-config.ts: Generates separate Squid ACLs per protocol:
  • allowed_http_only with !CONNECT rule for HTTP
  • allowed_https_only with CONNECT rule for HTTPS
  • allowed_domains for both (existing behavior)
• src/cli.ts: Updated help text
• README.md: Added documentation section

Generated Squid Config Example

acl allowed_http_only dstdomain .legacy.example.com
acl allowed_https_only dstdomain .secure.example.com
acl allowed_domains dstdomain .example.com

http_access allow !CONNECT allowed_http_only
http_access allow CONNECT allowed_https_only
http_access deny !allowed_domains

Original prompt

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This section details on the original issue you should resolve

<issue_title>Split HTTP and HTTPS</issue_title>
<issue_description></issue_description>

<agent_instructions>the allowdomains should be able to split http and https and should be able to allow only http not https, or vice versa</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Split HTTP and HTTPS #112

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[github-actions]

Test Coverage Report

Metric	Coverage	Covered/Total
Lines	67.73%	806/1190
Statements	67.84%	827/1219
Functions	71.2%	89/125
Branches	63.88%	283/443

Coverage Thresholds

The project has the following coverage thresholds configured:

• Lines: 38%
• Statements: 38%
• Functions: 35%
• Branches: 30%

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Coverage report generated by `npm run test:coverage`