feat(terraform): scaffold terraform directory with README

infrastructure/terraform/README.md

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+# Terraform — OSVauco Infrastructure
+
+> **Status:** Fase C — ikke startet ennå.
+
+Terraform-modulene her vil erstatte `infrastructure/*.sh`-scriptene
+når Medioteq-leveransen (Fase C) starter.
+
+## Planlagt struktur
+- `main.tf` — Cloud Run, Cloud Build, IAP, budsjett, SA per kunde
+- `variables.tf` — customer_id, region, project_id
+- `outputs.tf` — Cloud Run URL, SA e-post
+
+## Kjøring (Fase C)
+```bash
+terraform init
+terraform plan -var="customer_id=medioteq"
+terraform apply -var="customer_id=medioteq"  # HITL-gate: krever manuell godkjenning
+```
+
+## State-backend
+GCS bucket: `propane-will-491900-m5-tfstate` (opprettes i Fase C)