stem95su: scheduled Drive->site sync CronJob (every 10m)

CronJob stem95su-gdrive-sync (*/10) mounts the content PVC RW and
rclone-syncs the read-only Drive folder "claude" (stem claude/files) onto
it (rclone/rclone:1.74.3, scope=drive.readonly, empty-source guard +
--max-delete 25). ESO ExternalSecret stem95su-rclone <- Vault
secret/stem95su. Requires the GCP OAuth app published to Production or the
refresh token expires ~weekly.

Lands the gdrive-sync stack on master (it had landed on a feature branch
by accident on the shared devvm checkout).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

stacks/traefik/main.tf

@@ -1,27 +0,0 @@
-variable "tls_secret_name" { type = string }
-variable "redis_host" { type = string }
-
-data "vault_kv_secret_v2" "secrets" {
-  mount = "secret"
-  name  = "platform"
-}
-
-# x402 wallet lives under secret/viktor (Viktor's personal config) — not
-# secret/platform — and is the only field this stack needs from there.
-data "vault_kv_secret_v2" "viktor" {
-  mount = "secret"
-  name  = "viktor"
-}
-
-module "traefik" {
-  source                 = "./modules/traefik"
-  tier                   = local.tiers.core
-  crowdsec_api_key       = data.vault_kv_secret_v2.secrets.data["ingress_crowdsec_api_key"]
-  redis_host             = var.redis_host
-  tls_secret_name        = var.tls_secret_name
-  auth_fallback_htpasswd = data.vault_kv_secret_v2.secrets.data["auth_fallback_htpasswd"]
-  x402_wallet_address    = lookup(data.vault_kv_secret_v2.viktor.data, "x402_wallet_address", "")
-  # Reuses the existing Alertmanager Slack incoming webhook — same channel as
-  # other infra alerts. Payment events arrive as a normal Slack message.
-  x402_notify_webhook_url = lookup(data.vault_kv_secret_v2.viktor.data, "alertmanager_slack_api_url", "")
-}