feat: smart zomboid traffic filtering with packet-size detection

Replace per-IP hashlimit with smarter filtering that distinguishes
legitimate players from scanner bots based on packet behavior:
- Players send varied packet sizes (53, 37, 1472 bytes)
- Scanners only send 53-byte query packets

New firewall rule chain:
- Priority 2: Mark + ACCEPT non-query packets (verifies player)
- Priority 3: ACCEPT queries from verified IPs (1 hour TTL)
- Priority 4: LOG rate-limited queries from unverified IPs
- Priority 5: DROP rate-limited queries (2 burst, then 1/hour)

Also includes:
- Fail2ban zomboid jail with tighter thresholds (5 retries/4h, 1w ban)
- Graylog streams for zomboid-connections, zomboid-ratelimit, fail2ban
- GeoIP pipeline enrichment for zomboid traffic
- Fluent-bit inputs for ratelimit logs and fail2ban events
- Remove Legendary Katana mod (Workshop 3418366499) - removed from Steam
- Bump Immich to v2.5.0
- Fix fulfillr config (nil → null)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ansible/roles/common/files/fail2ban/jails/zomboid.local

@@ -0,0 +1,9 @@
+[zomboid]
+enabled   = true
+filter    = zomboid
+banaction = iptables-allports
+backend   = systemd
+maxretry  = 5
+findtime  = 4h
+bantime   = 1w
+ignoreip  = 127.0.0.1/32 192.168.1.0/24