Add audit logging and fix type annotations

[C0MPL3XDEV]

Summary

• Add append-only audit log module with SHA256-hashed queries, JSON Lines format, session ID tracking
• Refactor provider interface: run() wraps execute() with automatic audit logging
• Fix type annotation warnings across all providers with type: ignore[assignment] casts

Files changed (10 files, +229 -28)

• eagleosint/audit.py — new audit log module
• eagleosint/plugin.py — run() method + audit integration
• providers: bitly, github, godorker, mailfinder, network, phoneinfo, userrecon — type casts
• tests/test_audit.py — 9 tests

Test plan

• All 123 tests pass
• Audit log append-only, SHA256 deterministic
• Provider wrappers correctly cast result types