Inventory cleanup; add ipt-server host_vars for all ipt hosts.

- hosts: remove unreachable/decommissioned hosts (file-ah-neu, file-ah-alt,
  file-km-neu, ga-al-gw-neu, gw-opp-neu, zapata-neu, zapata-alt, bbb-server,
  ki-fm, server28, ...) and duplicate aliases (etherpad = b.ns,
  cl-irights-neu = cl-irights, oolm-db = o21, devel-ruby = devel-todo).
- host_vars: add <short>-ipt-server.yml (fw_manage_config: false) for all
  hosts running the ipt-server firewall, generated by extract-fw-host-vars.py.
- host_vars: move/remove obsolete host directories, replace alias
  directories by symlinks (cl-lubax -> o32, cl-vbrg -> o34, oolm-db -> o21).

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

host_vars/server26.warenform.de/server26-ipt-server.yml

@@ -0,0 +1,34 @@
+---
+# ipt-firewall configuration for server26.warenform.de
+# Generated by extract-fw-host-vars.py - review before committing!
+# Place in: host_vars/<hostname>/<short-hostname>-ipt-server.yml
+
+fw_manage_config: false
+
+# --- Network
+fw_ext_interfaces:
+  - "br0"
+fw_ext_ips_v4:
+  - "178.63.33.18"
+fw_ext_ips_v6:
+  - "2a01:4f8:110:401b::2"
+fw_lxc_guest_ips_v4:
+  - "78.46.47.84"
+  - "78.46.47.82"
+fw_lxc_guest_ips_v6:
+  - "2a01:4f8:110:401b::84"
+  - "2a01:4f8:110:401b::82"
+
+# --- Munin
+munin_remote_ipv4: 37.27.121.227
+munin_remote_ipv6: "2a01:4f9:3070:2bda::227"
+
+# --- Bridged / LXC
+fw_do_not_firewall_bridged_traffic: true
+fw_do_not_firewall_lx_guest_systems: true
+
+# --- Forwarding
+fw_kernel_forward_between_interfaces: true
+
+# --- Block
+fw_blocked_ips_v4: 222.184.0.0/13 61.160.0.0/16 116.8.0.0/14