feat(web): two-stage questionnaires, screening result and diary by result

- Sign-in: centred ЕМИАС card without the sidebar; anonymous entry asks «Депрессия / ПТСР».
- Stage 1 is the same for everyone and follows the fixed order of the MVP questionnaire:
  PHQ-2 → trauma filter/TSQ → RUS-AUDIT-S → C-SSRS → context; stage 2 only where stage 1
  is positive. Starts without a profile.
- After stage 1 the patient sees a preliminary result (screening, not a diagnosis), stored
  with the record; it switches on the diary modules (depression / PTSD).
- Stage 2 diary: morning (sleep, sleep quality, alcohol) and evening (mood, medication,
  3 PHQ-9 items in rotation, short PCL-5); C-SSRS since last contact only under risk;
  flags on weekly means against the personal norm; scheduled full scales with change
  (remission, response, worsening).
- Questionnaire log: GET /me/{token}/results and the «Мои результаты» screen.
- Questionnaires centred without the sidebar and without scale names; «Продолжить позже»
  goes home; confirmations are toasts; free-text comments are optional.
- Demo policy config/questionnaire_demo.yaml (INTAKE_DEMO only, not a clinical approval).

ADR-012.

Refs #77

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

app/dialog/flows/core.py

@@ -69,7 +69,9 @@ async def onboarding_entry(ctx: Ctx, after: str | None = None) -> str:
     modules = list(profile.modules) if profile is not None and profile.modules else []
     from app.core.intake_runtime import intake_enabled
 
-    if after is None and intake_enabled() and any(m in modules for m in ("veteran", "depression")):
+    # Stage 1 is the same for everyone (ADR-012): it does not depend on modules, which it sets itself — an anonymous
+    # person has no profile at all before it.
+    if after is None and intake_enabled():
         return "intake.start"
     if after in modules:
         modules = modules[modules.index(after) + 1 :]