feat: implement setPasscodeForMobile functionality

- Added a new API endpoint to set a user passcode with validation.
- Created SetPasscodeDTO for passcode input validation.
- Implemented setUserPasscode method in UserService to handle passcode setting.
- Updated user.yml to include the new set-passcode endpoint.
- Created setPasscodeForMobile handler to manage the passcode setting logic.
- Removed unused test-stepper-handler.ts file.
- Deleted Dockerfile, docker-compose.yml, init.sql, and serverless.yml.backup files as part of cleanup.

serverless/functions/user.yml

@@ -45,3 +45,19 @@ verifyOtpForUser:
     - httpApi:
         path: /user/verify-otp
         method: post
+
+      
+setPasscodeForMobile:
+  handler: src/modules/user/handlers/authentication/setPasscodeForMobile.handler
+  memorySize: 384
+  package:
+    patterns:
+      - 'src/modules/user/**'
+      - ${file(./serverless/patterns/base.yml):pattern1}
+      - ${file(./serverless/patterns/base.yml):pattern2}
+      - ${file(./serverless/patterns/base.yml):pattern3}
+      - ${file(./serverless/patterns/base.yml):pattern4}
+  events:
+    - httpApi:
+        path: /user/set-passcode
+        method: post