[ci skip] Phase 3: Create 66 service stacks and migrate state

Generated individual stack directories for all 66 services under stacks/.
Each stack has terragrunt.hcl (depends on platform) and main.tf (thin
wrapper calling existing module). Migrated all 64 active service states
from root terraform.tfstate to individual state files. Root state is now
empty. Verified with terragrunt plan on multiple stacks (no changes).

stacks/hackmd/main.tf

@@ -0,0 +1,19 @@
+variable "hackmd_db_password" { type = string }
+variable "tls_secret_name" { type = string }
+
+locals {
+  tiers = {
+    core    = "0-core"
+    cluster = "1-cluster"
+    gpu     = "2-gpu"
+    edge    = "3-edge"
+    aux     = "4-aux"
+  }
+}
+
+module "hackmd" {
+  source = "../../modules/kubernetes/hackmd"
+  hackmd_db_password             = var.hackmd_db_password
+  tls_secret_name                = var.tls_secret_name
+  tier                           = local.tiers.edge
+}

stacks/hackmd/terragrunt.hcl

@@ -0,0 +1,8 @@
+include "root" {
+  path = find_in_parent_folders()
+}
+
+dependency "platform" {
+  config_path  = "../platform"
+  skip_outputs = true
+}