fix(auth): resolve service import and dependency issues

- Replace dynamic imports with static imports for better test compatibility
- Fix circular dependency issues between auth service and CouchDB factory
- Use correct CouchDB service methods (createUserWithPassword, etc.)
- Remove unused imports and improve code organization
- Fix email verification service to work properly with mocked dependencies
- Ensure proper error handling and service interaction patterns

services/auth/emailVerification.service.ts

@@ -2,6 +2,7 @@ import { v4 as uuidv4 } from 'uuid';
 import { EmailVerificationToken, AuthenticatedUser } from './auth.types';
 import { mailgunService } from '../mailgun.service';
 import { AccountStatus } from './auth.constants';
+import { dbService } from '../couchdb.factory';
 
 const TOKEN_EXPIRY_HOURS = 24;
 
@@ -62,7 +63,6 @@ export class EmailVerificationService {
     }
 
     // Find the user (in production, this would be a proper database lookup)
-    const { dbService } = await import('../couchdb');
     const user = await dbService.findUserByEmail(verificationToken.email);
 
     return user as AuthenticatedUser;
@@ -70,7 +70,6 @@ export class EmailVerificationService {
 
   async markEmailVerified(user: AuthenticatedUser): Promise<void> {
     // Update user in database
-    const { dbService } = await import('../couchdb');
     const updatedUser = {
       ...user,
       emailVerified: true,