feat: add remote hashcat backend support

[l50]

Key Changes:

• Added optional remote cracking mode that delegates hashcat jobs to an HTTP service when configured
• Implemented authenticated job submission, polling, timeout handling, and potfile retrieval for remote jobs
• Preserved local hashcat execution as the default path when remote service configuration is absent
• Scoped remote execution to simple wordlist attacks so service-owned GPU and wordlist resources remain isolated

Added:

• Remote hashcat client module - Adds HTTP integration for submitting jobs, polling job status, retrieving cracked results, handling bearer authentication, and normalizing local wordlist paths to remote-safe basenames
• Remote service configuration support - Enables remote mode through HASHCAT_SERVICE_URL and requires HASHCAT_TOKEN for authenticated requests
• Remote result handling - Returns crackd logs, potfile contents, remote errors, exit codes, and timeout failures through the existing ToolOutput structure

Changed:

• Hashcat cracking flow - Updates crack_with_hashcat to check for remote service configuration first and delegate to the remote backend when available, while keeping the existing local hashcat behavior unchanged otherwise