feat: Add manual email sending workflow and related database changes

- Implemented a new n8n workflow for manual email sending, including webhook trigger, order data fetching, email building, and sending.
- Added logic to format email content with customer and order details.
- Introduced new columns in the sales_orders table to track email sending status.
- Updated database functions to handle new rental types and email status.
- Created new RPCs for updating email status and retrieving email details for sales orders.

n8n/bootstrap/bootstrap-n8n.sh

@@ -3,6 +3,8 @@ set -eu
 
 WORKFLOW_TEMPLATE="${N8N_WORKFLOW_TEMPLATE:-/opt/mc-cars/workflows/01-qualification-payment-email.json}"
 WORKFLOW_RENDERED="/tmp/01-qualification-payment-email.rendered.json"
+WORKFLOW03_TEMPLATE="/opt/mc-cars/workflows/03-manual-email-send.json"
+WORKFLOW03_RENDERED="/tmp/03-manual-email-send.rendered.json"
 CREDENTIALS_FILE="/tmp/mc-cars-credentials.json"
 
 required_var() {
@@ -80,4 +82,17 @@ n8n import:workflow --input="$WORKFLOW_RENDERED"
 echo "[n8n-bootstrap] Activating workflow ${N8N_PAYMENT_WORKFLOW_ID}"
 n8n update:workflow --id="${N8N_PAYMENT_WORKFLOW_ID}" --active=true
 
+# Process and import workflow 03 - Manual Email Send
+if [ -f "$WORKFLOW03_TEMPLATE" ]; then
+  sed \
+    -e "s/__POSTGRES_CREDENTIAL_ID__/${POSTGRES_ID_ESCAPED}/g" \
+    -e "s/__SMTP_CREDENTIAL_ID__/${SMTP_ID_ESCAPED}/g" \
+    -e "s|__PAYPAL_KAUTION_LINK__|${KAUTION_LINK_ESCAPED}|g" \
+    -e "s|__PAYPAL_MIETE_LINK__|${MIETE_LINK_ESCAPED}|g" \
+    "$WORKFLOW03_TEMPLATE" > "$WORKFLOW03_RENDERED"
+
+  echo "[n8n-bootstrap] Importing workflow 03 (Manual Email Send)"
+  n8n import:workflow --input="$WORKFLOW03_RENDERED"
+fi
+
 echo "[n8n-bootstrap] Bootstrap complete"