feat: move syscalls off UI thread; refactor mach write protection

[JeanExtreme002]

Summary

Moves two expensive/potentially-blocking syscalls off the Qt UI thread and
refactors the macOS Mach write path.

Changes

UI-thread write offloading (cheat_poll_worker.py, cheat_table.py)Inline value edits in the cheat table previously called write_process_memory
directly on the UI thread. A slow target or a page fault would stall the
interface for the full duration of the syscall. Writes are now queued via
_CheatPollWorker.request_write() and drained at the start of each poll tick.
Failures are surfaced through the new write_failed signal so the cheat table
can show an error dialog without the syscall touching the UI thread.

Region snapshot built on scan worker (scan_worker.py, main_window.py)The first-scan snapshot of memory regions was previously enumerated on the UI
thread before the scan worker started. On a large target this could visibly
stall the interface. When ScanRequest.build_snapshot=True and no cached
snapshot is supplied, FirstScanWorker now enumerates regions itself and
emits the result via the new snapshot_ready signal so the main window can
cache it for subsequent refine/update scans.

macOS Mach write path (macos/functions.py)Extracted the protect-flip logic from _mach_write into a standalone
_elevated_write_protection context manager. _mach_write is now a thin
wrapper that calls mach_vm_write directly on the fast path and defers to the
context manager only on a retry-eligible failure code. The error messages now
consistently report the original kern return, not the one from the retry.

mach_port_deallocate error handling (macos/functions.py)The return value was previously ignored. Failures are now logged as warnings so
send-right leaks are visible instead of silent.

pyproject.toml

• Added maintainers field.
• Added Funding URL to [project.urls].
• Pinned hatchling>=1.27 (required for the PEP 639 SPDX license = "MIT"
  expression and license-files glob already present in the file).

**.github/FUNDING.yml**Added GitHub Sponsors configuration.

Tests

Two new tests in tests/test_cheat_poll_worker.py cover:

• request_write is queued and the syscall is deferred until _drain_pending_writes runs.
• A write failure comes back as a structured failure tuple (not an exception on the caller's thread).