App portal/feature/draft save and load

[ph4iry]

Added MongoDB-based drafting/saving

🎫 Issue #483.

▶ Changelist:

• added getDraft(userId) and saveDraft(userId, responses) to query/update applicant_data by the id of the user submitting
• GET /api/v1/registration accepts either a header or query param for the userId when interacting with the endpoint; this will be filled in automatically later down the line
• POST /api/v1/registration returns { ok: true, savedAt } for a "saved X ago" timestamp
• finalized application data document shape; see src/lib/application/service.ts

📝 Notes + 🚧 TODO:

• in previous commits there was a service test file to do integration tests on the three main qualities specified in the ticket (no document handling, saving/reading round trip, autosave still keeps documents submitted after saving);to prevent random files it's removed for this PR

🧪 Testing:

• Manually, you can start the dev server and temporarily append a userId to REGISTRATION_API in ApplicationForm.tsx and wait for autosave to verify the document is shown in Mongo

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Project	Deployment	Actions	Updated (UTC)
core-live	Ready	Preview, Comment	Jul 14, 2026 3:35pm
core-main	Ready	Preview, Comment	Jul 14, 2026 3:35pm