Release v3.23.3-2.6.16

test: enhance verification script with auto README update

- Add bin/ script validation (executability, bash syntax)
- Add config file syntax tests
- Add Easy-RSA PKI workflow tests (init, build-ca, sign, CRL, TA key)
- Add OpenVPN config validation tests
- Add environment variable validation (TRUST_SUB, GUEST_SUB, HOME_SUB)
- Add cipher/auth feature flag tests
- Add apk list version detection for accurate versioning
- Add auto-update README.md with version badges (UPDATE_README=true)
- Add weekly auto-release workflow (.github/workflows/weekly-release.yml)
  - Runs every Sunday at 02:00 UTC
  - Version comparison and conditional release
  - Auto-update README and create GitHub Release