fix: switch contact form to use local SMTP (Maddy) instead of Mailgun

Changed contact form email delivery to use local Maddy SMTP server for better reliability.

**Changes:**
- Created new SMTP service (lib/smtp.ts) using nodemailer
- Configured to use localhost:25 (Maddy SMTP)
- Updated contact API to use smtpService instead of mailgunService
- Installed nodemailer and @types/nodemailer

**Benefits:**
- Simpler configuration (no external API dependencies)
- Local email delivery (more reliable for internal emails)
- No API rate limits or authentication issues
- Direct delivery to contact@biblical-guide.com

**Roundcube still uses Mailgun SMTP** for outgoing emails from webmail interface.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/smtp.ts

@@ -0,0 +1,111 @@
+import nodemailer from 'nodemailer'
+
+interface EmailOptions {
+  to: string | string[]
+  subject: string
+  text?: string
+  html?: string
+  from?: string
+  replyTo?: string
+}
+
+interface SendEmailResult {
+  success: boolean
+  messageId?: string
+  error?: string
+}
+
+class SMTPService {
+  private transporter: any
+
+  constructor() {
+    // Configure nodemailer to use local Maddy SMTP server
+    this.transporter = nodemailer.createTransport({
+      host: 'localhost',
+      port: 25,
+      secure: false, // Use STARTTLS
+      tls: {
+        rejectUnauthorized: false // Accept self-signed certificates
+      },
+      // Maddy accepts mail on port 25 without authentication for localhost
+      requireTLS: false
+    })
+  }
+
+  async sendEmail(options: EmailOptions): Promise<SendEmailResult> {
+    try {
+      const mailOptions = {
+        from: options.from || 'Biblical Guide <no-reply@biblical-guide.com>',
+        to: Array.isArray(options.to) ? options.to.join(', ') : options.to,
+        subject: options.subject,
+        text: options.text,
+        html: options.html,
+        replyTo: options.replyTo
+      }
+
+      const info = await this.transporter.sendMail(mailOptions)
+
+      return {
+        success: true,
+        messageId: info.messageId
+      }
+    } catch (error) {
+      console.error('SMTP send error:', error)
+      return {
+        success: false,
+        error: error instanceof Error ? error.message : 'Unknown error'
+      }
+    }
+  }
+
+  async sendContactForm(data: {
+    name: string
+    email: string
+    subject: string
+    message: string
+  }): Promise<SendEmailResult> {
+    const html = `
+      <h2>New Contact Form Submission</h2>
+      <p><strong>Name:</strong> ${data.name}</p>
+      <p><strong>Email:</strong> ${data.email}</p>
+      <p><strong>Subject:</strong> ${data.subject}</p>
+      <p><strong>Message:</strong></p>
+      <div style="background: #f5f5f5; padding: 15px; border-radius: 5px;">
+        ${data.message.replace(/\n/g, '<br>')}
+      </div>
+    `
+
+    const text = `
+New Contact Form Submission
+
+Name: ${data.name}
+Email: ${data.email}
+Subject: ${data.subject}
+
+Message:
+${data.message}
+    `
+
+    return this.sendEmail({
+      to: 'contact@biblical-guide.com',
+      subject: `Contact Form: ${data.subject}`,
+      html,
+      text,
+      replyTo: data.email
+    })
+  }
+
+  async testConnection(): Promise<{ success: boolean; error?: string }> {
+    try {
+      await this.transporter.verify()
+      return { success: true }
+    } catch (error) {
+      return {
+        success: false,
+        error: error instanceof Error ? error.message : 'Connection failed'
+      }
+    }
+  }
+}
+
+export const smtpService = new SMTPService()