feat(web): patient web app with ЕМИАС (demo) and anonymous sign-in

A second channel to the same dialog engine as the Telegram bot: consent,
onboarding, scales and check-ins come from app/dialog; the bot is unchanged.

- API: /auth/emias (doctor's one-time connect code via EmiasMock),
  /auth/emias/demo (synthetic personas), /auth/anonymous (random token,
  nothing stored in the identity DB), /crisis/resources from crisis.yaml
- web/: React + TS + Vite, mobile-first, safe areas, hash routing,
  tokens and texts isolated for a Capacitor mobile build

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/api/fixtures.py

@@ -9,6 +9,7 @@ from zoneinfo import ZoneInfo
 
 from app.api.schemas import (
     AlertOut,
+    DemoPersona,
     DiscontinuationRisk,
     DoseOut,
     PatientCard,
@@ -21,6 +22,11 @@ TZ = ZoneInfo("Europe/Moscow")
 TODAY = date(2026, 10, 3)
 DOCTOR_ID = "doc-smirnova"
 
+# Synthetic personas for the demo console and the demo ЕМИАС sign-in of the patient web app.
+DEMO_PERSONAS: list[DemoPersona] = [
+    DemoPersona(token="tok-andrey", display_name="Андрей С.", therapy_day=13, scenario="data/synthetic/andrey.jsonl"),
+]
+
 
 def _risk(score: int, factors: list[str]) -> DiscontinuationRisk:
     level = "high" if score >= 60 else "medium" if score >= 30 else "low"