Auth + identity bootstrap

[Joel-Joseph-George]

Context

• Part of the mobile sync epic: Mobile API integration & initial data sync #14

Background

No login flow for mvp. userId and userEmail are hardcoded in .env
and bootstrapped into MMKV on first launch. We then fetch the user record
from the server and write it into SQLite as the FK anchor for all subsequent
syncs.

Tasks

MMKV bootstrap

• Read USER_ID and USER_EMAIL from .env at app startup
• Write both into MMKV on first launch: userId (int), userEmail (string)
• Wire userEmail into the existing request interceptor as the
  x-user-email header on all authenticated requests

User identity fetch

• Call GET /users/email/:email using userEmail from MMKV
• Upsert the response into SQLite users table:

Column	Source
id	response id
username	response username
email	response email
first_name	response firstName
last_name	response lastName

MMKV keys set here

Key	Value	Set when
userId	00	App startup
userEmail	user@fluent.com	App startup

Acceptance criteria

• Every authenticated API request carries x-user-email header
• userId and userEmail are readable from MMKV immediately after app launch
• users table has exactly 1 row after first launch
• Re-running does not duplicate the row (upsert on id)