feat: enhance n8n workflows with dynamic credential management and email configuration

n8n/workflows/README.md

@@ -30,36 +30,36 @@ This folder contains exportable n8n workflow definitions for the MC Cars qualifi
 
 ## Setup Instructions
 
-### 1. Create Postgres credential in n8n
-- **Name:** `MC Cars Postgres`
-- **Host:** `db`
-- **Port:** `5432`
-- **Database:** `postgres`
-- **User:** `postgres`
-- **Password:** (value of `POSTGRES_PASSWORD` from `.env`)
+### 1. Configure `.env`
+The stack now bootstraps n8n credentials/workflow automatically on every `docker compose up`.
 
-### 2. Create SMTP credential in n8n
-- **Name:** `MC Cars SMTP`
-- **Host:** `heracles.mxrouting.net`
-- **Port:** `587` (STARTTLS) or `465` (SSL/TLS)
-- **User:** `office@mc-cars.at`
-- **Password:** use the mailbox password provided out-of-band (do not commit secrets to git)
-- **From:** `office@mc-cars.at`
+Required env variables:
+- `POSTGRES_PASSWORD`
+- `N8N_POSTGRES_CREDENTIAL_ID`
+- `N8N_POSTGRES_CREDENTIAL_NAME`
+- `N8N_SMTP_CREDENTIAL_ID`
+- `N8N_SMTP_CREDENTIAL_NAME`
+- `N8N_SMTP_HOST`
+- `N8N_SMTP_USER`
+- `N8N_SMTP_PASS`
+- `N8N_PAYPAL_KAUTION_LINK`
+- `N8N_PAYPAL_MIETE_LINK`
+- `N8N_PAYMENT_WORKFLOW_ID`
 
-### 3. Mailbox reference (for future incoming-email workflows)
+### 2. Mailbox reference (for future incoming-email workflows)
 - **IMAP host:** `heracles.mxrouting.net` (port `993`, SSL/TLS)
 - **POP3 host:** `heracles.mxrouting.net` (port `995`, SSL/TLS)
 - **Username:** `office@mc-cars.at`
 - **Password:** same mailbox password as SMTP
 
-### 4. Import workflows
-1. Open n8n at http://localhost:55590
-2. Go to **Workflows** → **Import from file**
-3. Import `01-qualification-payment-email.json`
-4. Import `02-mietvertrag-pdf-email.json`
-5. Open each workflow → assign the credentials created above → **Activate**
+### 3. Import behavior
+On startup, n8n runs `/opt/mc-cars/bootstrap/bootstrap-n8n.sh` which:
+1. Creates/updates Postgres and SMTP credentials from `.env`
+2. Renders `01-qualification-payment-email.json` placeholders
+3. Imports the workflow so nodes are always linked to the expected credential IDs
+4. Activates the payment workflow automatically (`n8n update:workflow --active=true`)
 
-### 5. Upload Mietvertrag template (optional)
+### 4. Upload Mietvertrag template (optional)
 1. Open Admin panel → **Einstellungen** tab
 2. Upload a DOCX file in the "Mietvertrag-Vorlage" section
 3. The template should contain these placeholders: