Add HackerOne integration support

[rachidlaad]

Summary

Add first-class HackerOne integration so Uxarion can connect to a user's HackerOne account and use authorized program data directly in the workflow.

Goals

• Authenticate a user with their HackerOne account or API token
• Pull program scope and policy data into Uxarion
• Use program data for safer scope-aware planning
• Support report creation/submission flows for valid findings

Product notes

This should be explicitly user-authorized and designed around scope safety. The initial version should prioritize read access to program and scope metadata before any report submission flow.

Suggested phases

1. Account/API authentication
2. Program and scope sync
3. Scope-aware session planning
4. Draft report generation for HackerOne-compatible format
5. Optional report submission with explicit user confirmation