feat: crisis message after the test and non-blocking; weapon answer triggers nothing; ЕМИАС demo = Никита

- CRISIS_BLOCKING (default off for the demo): a crisis no longer locks the dialog; the message and the
  doctor's acute alert still happen. The clinical protocol (blocking, immediate stop) stays behind the flag and
  keeps its tests.
- Crisis signals inside a questionnaire (intake red flags, high C-SSRS, PHQ-9 item 9) no longer stop it: the
  test is finished and the crisis message comes at the end; the doctor's alert is raised at once/at the end.
- Weapon access: asked and stored, triggers nothing (rule disabled, no red flag, no safety block).
- ЕМИАС demo persona is «Никита В.»; the one-click demo stays «Андрей С.».

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

app/config.py

@@ -80,6 +80,9 @@ class Settings(BaseSettings):
     demo_clock: bool = True
     # Initial screening (onboarding questionnaires) on/off — the default; the demo console can flip it at runtime.
     screening_enabled: bool = True
+    # Crisis blocks the dialog until the doctor's ack (clinical protocol) — off for the demo: the crisis message
+    # and the doctor's alert still happen, the patient keeps using everything.
+    crisis_blocking: bool = False
     tz: str = "Europe/Moscow"
 
     api_base_url: str = "http://localhost:8000"