fix: resolve 15 CRITICAL/HIGH/MEDIUM audit findings from DeepReport

Addresses findings C-02, C-05, H-01, H-02, H-03, H-04, H-07, H-08,
M-01, M-02, M-05, M-07, M-08, M-12, plus encryption script fixes.

Changes:
- run.sh: Enforce host FDE check (C-02), make sbverify fatal (H-07),
  add module.sig_enforce to Docker-embedded UKI (H-08)
- usb-automount.sh: Add noexec,nosuid,nodev mount options (C-05),
  restrict dmask/fmask, add input validation, add audit logging (M-08)
- security-hardening.sh (live): Set StrictHostKeyChecking yes (H-01),
  remove sshd_config generation (H-02), expand WiFi blacklist (M-12)
- firewall-setup.sh (live): Remove inbound ICMP echo, narrow WG port
  range to 51820 only (M-05)
- firewall-setup.sh (src): Add ct state established,related (H-03)
- security-hardening.sh (src): Fix apply_security_hardening to call
  configure_ssh_client and configure_fim with separate output paths (M-01)
- install-scripts.sh: Remove football from sudo group (M-02)
- mount-hardening.sh: Ensure /tmp,/var/tmp,/dev/shm always hardened
  even without existing fstab entries (M-07)
- encryption-setup.sh: Fix cryptsetup stdin syntax (H-05), add dynamic
  LUKS device discovery (H-06), fix recovery key generation (M-04),
  fix crypttab sed pattern
- qr-code-import.sh: Restrict temp file permissions (H-04)
- Tests updated to match new security posture

All 786+ tests pass. Zero shellcheck warnings.

Reference: DeepReport-2026-05-08.md findings C-02, C-05, H-01 through
H-08, M-01, M-02, M-05, M-07, M-08, M-12

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

src/security-hardening.sh

@@ -77,7 +77,7 @@ Host *
     ServerAliveCountMax 2
     
     # Strict host key checking
-    StrictHostKeyChecking ask
+    StrictHostKeyChecking yes
     UserKnownHostsFile ~/.ssh/known_hosts
 EOF
 
@@ -327,12 +327,26 @@ EOF
 apply_security_hardening() {
   echo "Applying security hardening..."
 
-  create_wifi_blacklist "${1:-}"
-  create_bluetooth_blacklist "${1:-}"
-  configure_ssh "${1:-}"
-  configure_password_policy "${1:-}"
-  configure_system_limits "${1:-}"
-  configure_audit_rules "${1:-}"
+  local output_dir="${1:-}"
+  if [[ -n "$output_dir" && "$output_dir" != "" ]]; then
+    mkdir -p "$output_dir"
+    create_wifi_blacklist "${output_dir}/blacklist-wifi.conf"
+    create_bluetooth_blacklist "${output_dir}/blacklist-bluetooth.conf"
+    configure_ssh_client "${output_dir}/ssh_config"
+    configure_password_policy "${output_dir}/pwquality.conf"
+    configure_system_limits "${output_dir}/security-limits.conf"
+    configure_fim "${output_dir}/aide.conf"
+    configure_audit_rules "${output_dir}/audit.rules"
+  else
+    create_wifi_blacklist
+    create_bluetooth_blacklist
+    configure_ssh_client
+    configure_password_policy
+    configure_system_limits
+    configure_fim
+    initialize_fim
+    configure_audit_rules
+  fi
 
   echo "Security hardening completed."
   echo "IMPORTANT: Run 'aideinit' to initialize file integrity database after installation"