Role ipt-server: sync with ipt-server repo (93d9af8); adapt extract-fw-host-vars.py.

- Update firewall scripts and shared conf files from firewall/ipt-server
  (HTTP connection limits, IPv6 TCP MSS clamping, ban_ipv6_mask,
  mattermost TCP fallback, rename 'stansard_*' -> 'standard_*').
- New role variables: fw_set_max_new_http_conn_per_ip_per_second,
  fw_max_http_new_conn_per_ip_per_second, fw_set_max_concurrent_http_conn_per_ip,
  fw_max_concurrent_http_conn_per_ip, fw_set_max_new_http_conn_per_second,
  fw_max_new_http_conn_per_second, fw_throttle_tcp6_mss_for_https,
  fw_tcp6_mss_for_https_val, fw_mm_tcp_ports_in, fw_ban_ipv6_mask.
- Split fw_blocked_ips into fw_blocked_ips_v4 / fw_blocked_ips_v6 and
  rename it in host_vars accordingly.
- Restart firewall when scripts or shared conf files change.
- extract-fw-host-vars.py: map new variables, normalize '${var}' and renamed
  bash variables, fall back to IPv6 for shared variables and warn if IPv4
  and IPv6 values differ.
- README.md / MIGRATION.md: document host_vars naming
  (<short-hostname>-ipt-server.yml) and new variables.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

roles/ipt-server/files/etc/ipt-firewall/ban_ipv6.list.sample

@@ -10,8 +10,10 @@
 # -
 # -
 # - Note: 
-# -    - If no mask is given mask will be set to '64'
+# -    - If no mask is given mask will be set to 'ban_ipv6_mask' (main_ipv6.conf),
+# -      default is '128'
 # -    - wrong addresses like '2g01::1' or '2a01::1/129' will be ignored
+# -    - entries covering an own (global) address of this host will be ignored
 # -
 # - Example:
 # -    240e:ec:4ab1:feba:e8b4:4fb1:7984:4c