docs: archive entra materials and simplify deployment docs

scripts/deploy/phase7-database-migrations.sh

@@ -15,17 +15,14 @@ log_info "=========================================="
 
 cd "${PROJECT_ROOT}"
 
-# Get database URL from Key Vault or environment
+# Get database URL from environment or a local deployment secret file.
+if [ -z "${DATABASE_URL:-}" ] && [ -f "${STATE_DIR}/secrets/${ENVIRONMENT}.env" ]; then
+  # shellcheck source=/dev/null
+  source "${STATE_DIR}/secrets/${ENVIRONMENT}.env"
+fi
+
 if [ -z "${DATABASE_URL:-}" ]; then
-  log_info "Retrieving DATABASE_URL from Azure Key Vault..."
-  DATABASE_URL=$(az keyvault secret show \
-    --vault-name "${KEY_VAULT_NAME}" \
-    --name "database-url-${ENVIRONMENT}" \
-    --query value -o tsv 2>/dev/null || echo "")
-  
-  if [ -z "${DATABASE_URL}" ]; then
-    error_exit "DATABASE_URL not found in Key Vault and not set in environment"
-  fi
+  error_exit "DATABASE_URL not found in the environment or ${STATE_DIR}/secrets/${ENVIRONMENT}.env"
 fi
 
 log_step "7.1 Running database migrations for ${ENVIRONMENT}..."
@@ -67,4 +64,3 @@ save_state "phase7" "complete"
 log_success "=========================================="
 log_success "Phase 7: Database Migrations - COMPLETE"
 log_success "=========================================="
-