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>

config/questionnaire_demo.yaml

@@ -0,0 +1,21 @@
+# DEMO ONLY (INTAKE_DEMO=1 + demo clock, synthetic data). NOT a clinical approval: the real policy is
+# config/questionnaire.yaml and stays closed until the doctor's decisions C01–C09 (docs/clinical/README.md).
+# Values follow the MVP PDF so the demo can reach a result and stage 2:
+#   C01 → graded: low C-SSRS risk shows the safety plan and continues (PDF p.11, routing table);
+#   C02 → full RUS-AUDIT from zone II of RUS-AUDIT-S (WHO zones, Bunova 2022).
+version: mvp-v2-demo-2026-10-04
+approval:
+  reviewer: "DEMO — синтетические данные, не клиническое согласование"
+  decision_reference: "INTAKE_DEMO"
+  approved_at: "2026-10-04T00:00:00+03:00"
+  policy_version: mvp-v2-demo-2026-10-04
+cssrs_positive_policy: graded
+rus_audit_s_expand_from_zone: 2
+phq2_expand_at: 2
+tsq_expand_at: 6
+phq9_psychologist_at: 5
+phq9_specialist_at: 10
+phq9_priority_at: 20
+pcl5_specialist_at: 31
+pcl5_priority_at: 50
+pcl5_behavior_flag_at: 3