Add SMTP/email credentials for all managed websites

- tomsjavajive.com: CyberMail API live (smtp_49a1fa9c0f15d2d7)
- tomtomgames.com: CyberMail API live (smtp_ad34c4d915da7bfc)
- epictravelexpeditions.com: SendGrid placeholder (not yet configured)
- parkerslingshot.epictravelexpeditions.com: Mailjet placeholder (not configured)
- parkerslingshotrentals.com: Mailjet placeholder (not configured)
- orbishosting.com / jarvis: no email required

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

parkerslingshot.epictravelexpeditions.com.md

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+# parkerslingshot.epictravelexpeditions.com — Email Configuration
+
+**Provider:** Mailjet (placeholder — NOT configured)
+**Status:** ⚠️ API keys not set — emails are silently dropped
+
+## Current State
+The site uses Mailjet API keys set to placeholder values.
+Email sending is disabled until real keys are provided.
+
+## Config File
+`/home/epictravelexpeditions.com/parkerslingshot/db.php`
+
+```php
+define("MAILJET_API_KEY",    "YOUR_MAILJET_API_KEY");
+define("MAILJET_SECRET_KEY", "YOUR_MAILJET_SECRET_KEY");
+define("MAIL_FROM",          "noreply@parkerslingshotrentals.com");
+define("MAIL_FROM_NAME",     "Parker County Slingshot Rentals");
+define("ADMIN_EMAIL",        "info@parkerslingshotrentals.com");
+```
+
+## Emails Sent
+- Booking confirmation → customer
+- Booking alert → admin
+- Waiver signed confirmation → customer + admin
+
+## Note
+The `sendEmail()` function uses Mailjet REST API. Could be switched to CyberMail
+by replacing the Mailjet endpoint/auth with CyberMail API.