fix: restore tree dropped by 6d224861; land stem95su gdrive-sync (10m) [ci skip]

6d224861 came from a --no-checkout worktree whose empty index made the
commit drop every file except two. This restores 05b50d2b's full tree and
correctly adds stacks/stem95su/gdrive-sync.tf + the service-catalog stem95su
entry. Forward-only (parent=6d224861, no force-push); [ci skip] since the
live infra was never applied from the broken commit.

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

stacks/platform/main.tf

@@ -0,0 +1,49 @@
+# =============================================================================
+# Platform Stack — Empty Shell (all modules extracted)
+# =============================================================================
+#
+# All modules have been extracted to independent stacks.
+# This stack remains as a dependency target for 72+ app stacks
+# that declare `dependency "platform" { skip_outputs = true }`.
+#
+# Outputs are kept as variable pass-throughs for any stacks
+# that may read them (though most use skip_outputs = true).
+# =============================================================================
+
+variable "tls_secret_name" { type = string }
+variable "redis_host" { type = string }
+variable "postgresql_host" { type = string }
+variable "mysql_host" { type = string }
+variable "mail_host" { type = string }
+
+output "tls_secret_name" {
+  value = var.tls_secret_name
+}
+
+output "redis_host" {
+  value = var.redis_host
+}
+
+output "postgresql_host" {
+  value = var.postgresql_host
+}
+
+output "postgresql_port" {
+  value = 5432
+}
+
+output "mysql_host" {
+  value = var.mysql_host
+}
+
+output "mysql_port" {
+  value = 3306
+}
+
+output "smtp_host" {
+  value = var.mail_host
+}
+
+output "smtp_port" {
+  value = 587
+}