Initial setup: mac_os installer with custom config

Contains both components needed for Mac setup:
- mac_os/: Installer scripts (from bkuhlmann/mac_os)
- mac_os-config/: Custom app configuration

Configured apps:
- Homebrew formulas: atuin, bash, ffmpeg, mas, mole, node, rename, ykman
- Homebrew casks: chromium, deepl, element, nextcloud, nova, proton suite, signal, transmit
- App Store: Affinity suite, Bitwarden, Final Cut Pro, Invoice Ninja, iWork, PastePal, xSearch

Usage: cd mac_os && ./bin/run

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

mac_os-config/.github/ISSUE_TEMPLATE/issue.md

@@ -0,0 +1,18 @@
+---
+name: Issue
+title: "Add|Update|Fix|Remove|Refactor "
+about: Report an issue. Please use only one of the subject prefixes.
+---
+
+<!--
+Please focus on well written issues. Context: https://alchemists.io/articles/software_issues.
+-->
+
+## Why
+<!-- Required. Describe, briefly, why this issue is important. -->
+
+## How
+<!-- Optional. List exact steps to implement or reproduce behavior. Screen shots/casts are welcome! -->
+
+## Notes
+<!-- Optional. Provide additional details like operating system, software version(s), stack dump, logs, or anything else that would be helpful. -->