feat: Add inspiration photo attachment to admin booking notifications

- Create sendEmailWithInspirationPhoto() function to handle photo attachments
- Add renderAdminBookingNotificationHTML() template for admin notifications
- Extract photo extension and content from base64 data URLs
- Generate unique filenames with customer name and timestamp
- Send separate admin notification email with photo attachment
- Include comprehensive booking details in admin email
- Add visual indicators for photo availability in email template
- Support both HTML and text versions of admin notifications
- Handle cases where no photo is uploaded gracefully
- Import treatments KV to get treatment names for admin emails

Features:
- Inspiration photos automatically attached to admin notifications
- Structured admin email with all booking details
- Photo filename includes customer name and timestamp
- Fallback handling for missing photos
- German localization for admin notifications
- Visual photo availability indicators (✅/❌)

Changes:
- email.ts: Add sendEmailWithInspirationPhoto() function
- email-templates.ts: Add renderAdminBookingNotificationHTML() template
- bookings.ts: Send admin notifications with photo attachments

src/server/lib/email.ts

@@ -89,4 +89,35 @@ export async function sendEmailWithAGB(params: SendEmailParams): Promise<{ succe
   return sendEmail(params);
 }
 
+export async function sendEmailWithInspirationPhoto(
+  params: SendEmailParams, 
+  photoData: string, 
+  customerName: string
+): Promise<{ success: boolean }> {
+  if (!photoData) {
+    return sendEmail(params);
+  }
+
+  // Extract file extension from base64 data URL
+  const match = photoData.match(/data:image\/([^;]+);base64,(.+)/);
+  if (!match) {
+    console.warn("Invalid photo data format");
+    return sendEmail(params);
+  }
+
+  const [, extension, base64Content] = match;
+  const filename = `inspiration_${customerName.replace(/[^a-zA-Z0-9]/g, '_')}_${Date.now()}.${extension}`;
+
+  params.attachments = [
+    ...(params.attachments || []),
+    {
+      filename,
+      content: base64Content,
+      type: `image/${extension}`
+    }
+  ];
+  
+  return sendEmail(params);
+}
+