migrate all secrets from SOPS to Vault KV

- Add vault provider to root terragrunt.hcl (generated providers.tf)
- Delete stacks/vault/vault_provider.tf (now in generated providers.tf)
- Add 124 variable declarations + 43 vault_kv_secret_v2 resources to
  vault/main.tf to populate Vault KV at secret/<stack-name>
- Migrate 43 consuming stacks to read secrets from Vault KV via
  data "vault_kv_secret_v2" instead of SOPS var-file
- Add dependency "vault" to all migrated stacks' terragrunt.hcl
- Complex types (maps/lists) stored as JSON strings, decoded with
  jsondecode() in locals blocks

Bootstrap secrets (vault_root_token, vault_authentik_client_id,
vault_authentik_client_secret) remain in SOPS permanently.

Apply order: vault stack first (populates KV), then all others.

stacks/changedetection/main.tf

@@ -3,9 +3,13 @@ variable "tls_secret_name" {
   sensitive = true
 }
 variable "nfs_server" { type = string }
-variable "homepage_credentials" {
-  type      = map(any)
-  sensitive = true
+data "vault_kv_secret_v2" "secrets" {
+  mount = "secret"
+  name  = "changedetection"
+}
+
+locals {
+  homepage_credentials = jsondecode(data.vault_kv_secret_v2.secrets.data["homepage_credentials"])
 }
 
 
@@ -171,6 +175,6 @@ module "ingress" {
     "gethomepage.dev/pod-selector" = ""
     "gethomepage.dev/widget.type"  = "changedetectionio"
     "gethomepage.dev/widget.url"   = "http://changedetection.changedetection.svc.cluster.local"
-    "gethomepage.dev/widget.key"   = var.homepage_credentials["changedetection"]["api_key"]
+    "gethomepage.dev/widget.key"   = local.homepage_credentials["changedetection"]["api_key"]
   }
 }

stacks/changedetection/providers.tf

@@ -1,7 +1,7 @@
 # Generated by Terragrunt. Sig: nIlQXj57tbuaRZEa
 variable "kube_config_path" {
-  type    = string
-  default = "~/.kube/config"
+  type      = string
+  default   = "~/.kube/config"
   sensitive = true
 }
 

stacks/changedetection/terragrunt.hcl

@@ -6,3 +6,8 @@ dependency "platform" {
   config_path  = "../platform"
   skip_outputs = true
 }
+
+dependency "vault" {
+  config_path  = "../vault"
+  skip_outputs = true
+}