Add Mailgun admin tools and contact API

prisma/schema.prisma

@@ -34,6 +34,7 @@ model User {
   uploadedFiles   MediaFile[]
   createdSocialMedia SocialMediaLink[] @relation("SocialMediaCreator")
   updatedSocialMedia SocialMediaLink[] @relation("SocialMediaUpdater")
+  updatedMailgunSettings MailgunSettings[] @relation("MailgunSettingsUpdater")
 
   @@index([role])
 }
@@ -369,4 +370,24 @@ model SocialMediaLink {
 
   @@unique([platform])
   @@index([isEnabled, order])
+}
+
+model MailgunSettings {
+  id              String   @id @default(uuid())
+  apiKey          String   // Encrypted Mailgun API key
+  domain          String   // Mailgun domain (e.g., mg.yourdomain.com)
+  region          String   @default("US") // US or EU
+  fromEmail       String   // Default from email address
+  fromName        String   // Default from name
+  replyToEmail    String?  // Optional reply-to address
+  isEnabled       Boolean  @default(false)
+  testMode        Boolean  @default(true)
+  webhookUrl      String?  // Mailgun webhook URL for tracking
+  updatedBy       String
+  createdAt       DateTime @default(now())
+  updatedAt       DateTime @updatedAt
+
+  updater         User     @relation("MailgunSettingsUpdater", fields: [updatedBy], references: [id])
+
+  @@index([isEnabled])
 }