[BE-66] Onboarding module — complete service, add controller, register module

[yusuftomilola]

Overview

backend/src/onboarding/onboarding.service.ts is the module's only file and is not registered. frontend/components/onboarding/ already exists.

Tasks

• Add an OnboardingProgress entity tracking per-user step completion (profile, payment method, tour booked, first booking, docs signed).
• Create module + controller: GET /onboarding/me (progress + next step), POST /onboarding/steps/:step/complete, POST /onboarding/skip.
• Auto-create a progress row on user registration (hook into the existing auth flow).
• Register OnboardingModule in app.module.ts.

Acceptance Criteria

• New user registration creates an onboarding record.
• GET /onboarding/me returns an accurate completion percentage and the next incomplete step.
• Completing every step marks onboarding finished and stops prompting.

Notes for Contributors

Comment below to be assigned.

[Nanafancy]

@Nanafancy has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Can i work on this

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[grantfox-oss]

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@Nanafancy's PR #1565 was approved and merged by @yusuftomilola.

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