refactor: improve service layer logging and configuration

- Change email service logging from console.log to console.warn for better visibility
- Update mailgun and couchdb configuration with improved error handling
- Enhance database seeder with better logging and error management
- Improve service factory patterns for better testability

services/email.ts

@@ -10,10 +10,10 @@ export class EmailService {
   async sendVerificationEmail(email: string, token: string): Promise<void> {
     // In a real implementation, this would send an actual email
     // For this demo, we'll just log the action
-    console.log(
+    console.warn(
       `📧 Sending verification email to ${email} with token: ${token}`
     );
-    console.log(`🔗 Verification link: /verify-email?token=${token}`);
+    console.warn(`🔗 Verification link: /verify-email?token=${token}`);
 
     // Simulate network delay
     await new Promise(resolve => setTimeout(resolve, 500));