feat: Sentry sustained-presence & panic alerts

[JordiMa]

Summary

Adds two security alerts driven by the SentryMode telemetry stream (the proven, streamable signal):

• 🚨 Sustained presence — when the vehicle stays in Sentry "Aware" (someone lingering around it) past a threshold, the owner gets a critical alert, re-alerted at a fixed cadence while the person remains, capped to avoid spam, ending with a clear "last reminder — no more alerts for this incident".
• 🚨 Panic — when Sentry escalates to "Panic" (alarm), a critical alert is sent.

The existing immediate Sentry "Aware" alert is kept.

Behaviour

(immediate)  Sentry alert (Warning)
+15s         critical "someone is lingering"          (1/3)
+30s         critical "someone is lingering"          (2/3)
+45s         critical "LAST REMINDER — still around,  (3/3, final)
             no more alerts for this incident"
             -> stops until the vehicle leaves Aware

Configuration

SENTRY_SUSTAINED_AWARE_SECONDS=15   # re-alert cadence (and initial threshold)
SENTRY_SUSTAINED_MAX_REPEATS=3      # safety cap per Aware episode

The cap also protects against an infinite loop if the vehicle goes offline while Aware.

Implementation notes

• New first-class alert types (sustained_presence, sustained_presence_final, panic) shown distinctly on Telegram, push, and the in-app history (FR/EN) — no generic fallback (resolveAlertTexts is an exhaustive Record<AlertEventType, …>, so a missing type is a compile error).
• SentryPresenceTrackerService manages a per-VIN re-alert interval with the cap + per-episode reset.
• Migration adds the new enum values to alert_events_type_enum.

Tests

• API: 127 alerts / notifications / telegram specs green
• Mobile: 23 alert specs green
• Type-clean & lint-clean on changed files