Support URL Input for Configuration Files

[jtdub]

Problem

Configuration files must currently be local files. In automation scenarios, configs are often stored in remote locations.

Proposed Solution

Support HTTP/HTTPS URLs for configuration input.

Security Considerations

• Timeout for HTTP requests (default: 30s)
• SSL verification with opt-out flag
• Size limit to prevent memory issues

Acceptance Criteria

• HTTP/HTTPS URLs work for both config options
• Timeout handling
• Clear error messages for network failures
• Documentation updated