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.

frontend/i18n.js

@@ -89,6 +89,7 @@ export const translations = {
         bpfWeekendRate: "Wochenendmiete",
         bpfWeekendDef: "Wochenende: Samstag 9:00 – Sonntag 20:00",
         bpfMaxKm: "Max. km/Tag",
+        bpfInclKmPerDay: "Inkl. km/Tag",
         bpfExtraKm: "Extra km",
         bpfPriceOverview: "Preisübersicht",
         bpfSelectForPrice: "Wähle Fahrzeug und Datum für eine Preisübersicht",
@@ -176,7 +177,7 @@ export const translations = {
         adminVehicleTab: "Fahrzeug",
         adminPeriod: "Zeitraum",
         adminKaution: "Kaution (€)",
-        adminMaxKmWeekend: "Max. km/Wochenendtag",
+         adminMaxKmWeekend: "Inkl. km/Wochenende",
         adminTotalPrice: "Gesamtbetrag",
         adminLifetimeValueCol: "Gesamtwert",
         adminTabGeneral: "Allgemein",
@@ -231,9 +232,20 @@ export const translations = {
         adminFirstContacted: "Erster Kontakt",
         adminFirstContactedEn: "First contacted",
         adminNote: "Notiz",
-        adminNoteEn: "Note",
+       adminNoteEn: "Note",
         adminSave: "Speichern",
         adminSaveEn: "Save",
+        adminPricePerKm: "Preis extra km (€)",
+        adminRentalType: "Miettyp",
+        rentalTypeWeekend: "Wochenende",
+        rentalTypeIndividuell: "Individuell",
+        adminSortOrder: "Ordnung",
+        adminEmailSent: "Email",
+        sendEmailButton: "E-Mail senden",
+        emailSentToast: "E-Mail wird erstellt und in Kürze gesendet...",
+        emailAlreadySent: "Bereits gesendet",
+        bpfIndividuellTitle: "Individuelle Mietdauer",
+        bpfIndividuellDesc: "Bei Mietdauer über 2 Tagen erstellen wir ein persönliches Angebot. Wir prüfen Verfügbarkeit und melden uns in Kürze per E-Mail bei Ihnen.",
     },
     en: {
         navCars: "Fleet",
@@ -323,7 +335,8 @@ export const translations = {
         bpfDailyRate: "Daily rate",
         bpfWeekendRate: "Weekend rate",
         bpfWeekendDef: "Weekend: Saturday 9 AM – Sunday 8 PM",
-        bpfMaxKm: "Max. km/day",
+         bpfMaxKm: "Max. km/day",
+        bpfInclKmPerDay: "Included km/day",
         bpfExtraKm: "Extra km",
         bpfPriceOverview: "Price overview",
         bpfSelectForPrice: "Select vehicle and date for a price overview",
@@ -411,7 +424,7 @@ export const translations = {
         adminVehicleTab: "Vehicle",
         adminPeriod: "Period",
         adminKaution: "Deposit (€)",
-        adminMaxKmWeekend: "Max. km/weekend day",
+         adminMaxKmWeekend: "Included km/weekend",
         adminTotalPrice: "Total",
         adminLifetimeValueCol: "Lifetime",
         adminTabGeneral: "General",
@@ -469,6 +482,17 @@ export const translations = {
         adminNoteEn: "Notiz",
         adminSave: "Save",
         adminSaveEn: "Speichern",
+        adminPricePerKm: "Extra km price (€)",
+        adminRentalType: "Rental type",
+        rentalTypeWeekend: "Weekend",
+        rentalTypeIndividuell: "Custom",
+        adminSortOrder: "Order",
+        adminEmailSent: "Email",
+        sendEmailButton: "Send Email",
+        emailSentToast: "Email is being prepared and will be sent shortly...",
+        emailAlreadySent: "Already sent",
+        bpfIndividuellTitle: "Custom Rental Duration",
+        bpfIndividuellDesc: "For rental periods over 2 days, we'll create a personalized quote. We'll check availability and get back to you via email shortly.",
     },
 };