chore(git): add .gitignore; purge accidentally tracked .ovpn and OS files

- Add comprehensive .gitignore: OS cruft, caches, archives, VPN/secret files, captures\n- Remove previously tracked .DS_Store and HTB.ovpn

.gitignore

@@ -0,0 +1,66 @@
+# OS
+.DS_Store
+Thumbs.db
+
+# Editors/IDE
+.vscode/
+.idea/
+
+# Python
+__pycache__/
+*.py[cod]
+*.pyo
+*.egg-info/
+.venv/
+venv/
+.env
+.env.*
+.python-version
+
+# Node/JS
+node_modules/
+
+# Logs & caches
+*.log
+logs/
+tmp/
+*.tmp
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.tox/
+.cache/
+
+# Coverage/build
+.coverage*
+coverage/
+htmlcov/
+dist/
+build/
+
+# Archives & captures
+*.zip
+*.tar
+*.tar.gz
+*.tgz
+*.7z
+*.gz
+*.rar
+*.pcap
+*.pcapng
+
+# VPN/Secrets & credentials
+*.ovpn
+*.key
+*.pem
+*.crt
+*.kdbx
+*.rdp
+*.pfx
+
+# Project-specific ignores
+# Do not commit bulky artifacts accidentally
+targets/*/www/*
+# Keep scan results, but ignore raw packet captures
+targets/*/scans/*.pcap*
+