Add --no-fireprox flag for direct connection mode

[altjx]

Summary

This PR adds a --no-fireprox flag that allows users to avoid AWS API Gateway (FireProx) and connect directly to target endpoints.

Why this feature?

CredMaster's core value proposition is evasive password spraying via FireProx IP rotation - and that remains the recommended approach for most use cases. However, there are legitimate scenarios where direct connections are preferable:

• Local testing/development: Quickly test plugins or validate target connectivity without AWS setup
• Complementary tooling: Users who want CredMaster's plugin ecosystem and features (jitter, delay, notifications, logging) but handle IP rotation through other means (VPN, proxychains, etc.)

Rather than requiring users to fork and modify the codebase for these use cases, this flag provides a simple opt-in escape hatch while preserving FireProx as the default behavior.

Changes

• Added --no-fireprox CLI flag (also supported in config files as "no_fireprox": true)
• When enabled:
  • Skips AWS credential validation
  • Creates direct URL entries instead of API Gateways
  • Skips API cleanup on exit
  • Displays "Direct Connection" mode in stats
• All existing functionality remains unchanged when flag is not used

Usage

# Direct connection (no AWS credentials required)
python3 credmaster.py --plugin msol -u users.txt -p passwords.txt --no-fireprox

# Config file support
{
    "no_fireprox": true,
    "plugin": "msol",
    ...
}

A warning is displayed when using this mode to remind users that all requests will originate from their IP address.