Checks IPv4/IPv6 ban lists, firehol and whitelist via ipset test.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

/check/<ip> returns JSON with ban status across IPv4/IPv6 ipsets,
firehol and whitelist. Runs as separate eterban-api.service on port 8275.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

- internal_interface (vmbr0): DNAT by destination for internal users
  accessing banned IPs on ports 80/443 → ban_server:82 (int2.py)
- IPv6: add ether3 DNAT, internal_interface DNAT by dst
- Fix duplicate for-loop bug in create_ip6tables_rules
- Add destroy rules for internal_interface (IPv4 + IPv6)
- Add TESTING.md with verification checklist

Default 2000000, was hardcoded 650000.

Default 2000000, was hardcoded 650000.

- eterban_switcher.py: return error on redis connection error
- add auto-unban with exponential backoff
- spec: use php_defver macro instead of hardcoded php8.1

- switch to php8.1-redis (ALT bug 46925)
- eterban: improve count output
- eterban: add clear command

- add i_interface2 support
- index.html: update text
- add IPv6 support
- eterban.service: add Restart=always
- eterban.service: add After:
- eterban.spec: add post/preun service section

- eterban.sh: add ban for ban manually
- eterban_switcher: increase maxelem

- add unban.py for gateway target
- add eterban cli for gateway target

- fix fail2ban require

- update README.md
- ban.php: get ip font settings.ini
- ban.py: drop config creating
- cleanup packing

- create common package

- fix prod-server/etc/eterban/settings.ini
- add new file
- update readme.md
- update README.md
- update README.md
- update settings.ini, code review in eterban_switcher.py, create ipset dump before exit