Add unified app_logs error logging across client and functions

[Copilot]

Introduce a single app_logs table to capture OCR, FX, expense save, invite, and auth failures from both the client (JWT) and Netlify functions (service role), while preventing client reads. Logging is fire‑and‑forget so user flows never block on telemetry.

• Database: add app_logs migration with RLS insert policy, no‑read policy, and indexes for event/time queries.
• Client logging: add src/lib/logger.js and wire FX failures, expense save failures (expense/splits), and auth init/profile/invite-claim errors.
• Functions logging: add shared writeLog helper; log OCR success/error (with raw snippets on parse failures) and invite flow errors.

Example:

await log('fx.error', {
  from: expenseCurrency,
  to: group?.currency || 'SGD',
  date: expenseDate,
  is_historical: isHistorical,
  http_status: err.status ?? null,
  error: err.message,
})

[netlify]

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