[ci skip] Infrastructure hardening: security, monitoring, reliability, maintainability

Phase 1 - Critical Security:
- Netbox: move hardcoded DB/superuser passwords to variables
- MeshCentral: disable public registration, add Authentik auth
- Traefik: disable insecure API dashboard (api.insecure=false)
- Traefik: configure forwarded headers with Cloudflare trusted IPs

Phase 2 - Security Hardening:
- Add security headers middleware (HSTS, X-Frame-Options, nosniff, etc.)
- Add Kyverno pod security policies in audit mode (privileged, host
  namespaces, SYS_ADMIN, trusted registries)
- Tighten rate limiting (avg=10, burst=50)
- Add Authentik protection to grampsweb

Phase 3 - Monitoring & Alerting:
- Add critical service alerts (PostgreSQL, MySQL, Redis, Headscale,
  Authentik, Loki)
- Increase Loki retention from 7 to 30 days (720h)
- Add predictive PV filling alert (predict_linear)
- Re-enable Hackmd and Privatebin down alerts

Phase 4 - Reliability:
- Add resource requests/limits to Redis, DBaaS, Technitium, Headscale,
  Vaultwarden, Uptime Kuma
- Increase Alloy DaemonSet memory to 512Mi/1Gi

Phase 6 - Maintainability:
- Extract duplicated tiers locals to terragrunt.hcl generate block
  (removed from 67 stacks)
- Replace hardcoded NFS IP 10.0.10.15 with var.nfs_server (114
  instances across 63 files)
- Replace hardcoded Redis/PostgreSQL/MySQL/Ollama/mail host references
  with variables across ~35 stacks
- Migrate xray raw ingress resources to ingress_factory modules

stacks/hackmd/main.tf

@@ -1,15 +1,8 @@
 variable "hackmd_db_password" { type = string }
 variable "tls_secret_name" { type = string }
+variable "nfs_server" { type = string }
+variable "mysql_host" { type = string }
 
-locals {
-  tiers = {
-    core    = "0-core"
-    cluster = "1-cluster"
-    gpu     = "2-gpu"
-    edge    = "3-edge"
-    aux     = "4-aux"
-  }
-}
 
 resource "kubernetes_namespace" "hackmd" {
   metadata {
@@ -97,7 +90,7 @@ resource "kubernetes_deployment" "hackmd" {
           env {
             name = "CMD_DB_URL"
             # value = format("%s%s%s", "postgres://codimd:", var.hackmd_db_password, "@localhost/codimd")
-            value = format("%s%s%s", "mysql://codimd:", var.hackmd_db_password, "@mysql.dbaas/codimd")
+            value = format("%s%s%s", "mysql://codimd:", var.hackmd_db_password, "@${var.mysql_host}/codimd")
           }
           env {
             name  = "CMD_USECDN"
@@ -121,7 +114,7 @@ resource "kubernetes_deployment" "hackmd" {
           name = "data"
           nfs {
             path   = "/mnt/main/hackmd"
-            server = "10.0.10.15"
+            server = var.nfs_server
           }
           #   iscsi {
           #     target_portal = "iscsi.viktorbarzin.lan:3260"