feat: Session persistence with Redis + Draft management fixes

- Implement session management API (/api/v1/session/create, verify, logout)
- Add session restoration from localStorage on page reload
- Fix session_id priority when loading drafts (use current, not old from DB)
- Add unified_id and claim_id to wizard payload sent to n8n
- Add Docker volume for frontend HMR (Hot Module Replacement)
- Add comprehensive session logging for debugging

Components updated:
- backend/app/api/session.py (NEW) - Session management endpoints
- backend/app/main.py - Include session router
- frontend/src/components/form/Step1Phone.tsx v2.0 - Create session after SMS
- frontend/src/pages/ClaimForm.tsx v3.8 - Session restoration & priority fix
- frontend/src/components/form/StepWizardPlan.tsx v1.4 - Add unified_id/claim_id
- docker-compose.yml - Add frontend volume for live reload

Session flow:
1. User verifies phone -> session created in Redis (24h TTL)
2. session_token saved to localStorage
3. Page reload -> session restored automatically
4. Draft selected -> current session_id used (not old from DB)
5. Wizard submit -> unified_id, claim_id, session_id sent to n8n
6. Logout -> session removed from Redis & localStorage

Fixes:
- Session token not persisting after page reload
- unified_id missing in n8n webhook payload
- Old session_id from draft overwriting current session
- Frontend changes requiring container rebuild

docs/SQL_CLAIMSAVE_PRIMARY_DRAFT_CLEAN.sql

@@ -0,0 +1,210 @@
+-- ============================================================================
+-- SQL запрос для n8n: Сохранение первичного черновика заявки (ЧИСТАЯ ВЕРСИЯ)
+-- ============================================================================
+-- Назначение: Сохранить первичный черновик сразу после генерации wizard_plan
+--             Использует session_token для связи (claim_id генерируется позже)
+--
+-- Параметры:
+--   $1 = payload_json (jsonb) - полный payload с wizard_plan, problem_description, 
+--                                AI Agent1, AI Agent13 и т.д.
+--   $2 = session_token (text) - сессия пользователя
+--   $3 = unified_id (text, опционально) - unified_id пользователя
+--
+-- Возвращает:
+--   claim - объект с claim_id (UUID), session_token, status_code, payload
+-- ============================================================================
+
+WITH partial AS (
+  SELECT 
+    $1::jsonb AS p, 
+    $2::text AS session_token_str,
+    NULLIF($3::text, '') AS unified_id_str
+),
+
+claim_lookup AS (
+  SELECT 
+    COALESCE(
+      (SELECT id FROM clpr_claims WHERE session_token = partial.session_token_str LIMIT 1),
+      gen_random_uuid()
+    ) AS claim_uuid
+  FROM partial
+),
+
+claim_created AS (
+  INSERT INTO clpr_claims (
+    id,
+    session_token,
+    unified_id,
+    channel,
+    type_code,
+    status_code,
+    payload,
+    created_at,
+    updated_at,
+    expires_at
+  )
+  SELECT 
+    claim_lookup.claim_uuid,
+    partial.session_token_str,
+    partial.unified_id_str,
+    'web_form',
+    COALESCE(partial.p->>'type_code', 'consumer'),
+    'draft',
+    jsonb_build_object(
+      'claim_id', NULL,
+      'problem_description', partial.p->>'problem_description',
+      'wizard_plan', 
+        CASE 
+          WHEN partial.p->>'wizard_plan' IS NOT NULL 
+            THEN (partial.p->>'wizard_plan')::jsonb
+          WHEN partial.p->'wizard_plan' IS NOT NULL AND jsonb_typeof(partial.p->'wizard_plan') = 'object'
+            THEN partial.p->'wizard_plan'
+          ELSE NULL
+        END,
+      'answers_prefill', 
+        CASE 
+          WHEN partial.p->>'answers_prefill' IS NOT NULL 
+            THEN (partial.p->>'answers_prefill')::jsonb
+          WHEN partial.p->'answers_prefill' IS NOT NULL AND jsonb_typeof(partial.p->'answers_prefill') = 'array'
+            THEN partial.p->'answers_prefill'
+          ELSE '[]'::jsonb
+        END,
+      'coverage_report',
+        CASE 
+          WHEN partial.p->>'coverage_report' IS NOT NULL 
+            THEN (partial.p->>'coverage_report')::jsonb
+          WHEN partial.p->'coverage_report' IS NOT NULL AND jsonb_typeof(partial.p->'coverage_report') = 'object'
+            THEN partial.p->'coverage_report'
+          ELSE NULL
+        END,
+      'ai_agent1_facts',
+        CASE 
+          WHEN partial.p->'ai_agent1_facts' IS NOT NULL AND jsonb_typeof(partial.p->'ai_agent1_facts') = 'object'
+            THEN partial.p->'ai_agent1_facts'
+          ELSE NULL
+        END,
+      'ai_agent13_rag',
+        CASE 
+          WHEN partial.p->'ai_agent13_rag' IS NOT NULL AND jsonb_typeof(partial.p->'ai_agent13_rag') = 'object'
+            THEN partial.p->'ai_agent13_rag'
+          WHEN partial.p->>'ai_agent13_rag' IS NOT NULL 
+            THEN to_jsonb(partial.p->>'ai_agent13_rag')
+          ELSE NULL
+        END,
+      'phone', partial.p->>'phone',
+      'email', partial.p->>'email'
+    ),
+    now(),
+    now(),
+    now() + interval '14 days'
+  FROM partial, claim_lookup
+  WHERE NOT EXISTS (
+    SELECT 1 FROM clpr_claims WHERE id = claim_lookup.claim_uuid
+  )
+  ON CONFLICT (id) DO NOTHING
+  RETURNING id, status_code, payload
+),
+
+claim_final AS (
+  SELECT 
+    CASE 
+      WHEN EXISTS (SELECT 1 FROM claim_created) 
+        THEN (SELECT id FROM claim_created LIMIT 1)
+      ELSE claim_lookup.claim_uuid
+    END AS claim_uuid
+  FROM claim_lookup
+),
+
+upd AS (
+  UPDATE clpr_claims c
+  SET 
+    unified_id = COALESCE(partial.unified_id_str, c.unified_id),
+    payload = jsonb_set(
+      jsonb_set(
+        jsonb_set(
+          jsonb_set(
+            jsonb_set(
+              COALESCE(c.payload, '{}'::jsonb),
+              '{wizard_plan}',
+              COALESCE(
+                CASE 
+                  WHEN partial.p->>'wizard_plan' IS NOT NULL 
+                    THEN (partial.p->>'wizard_plan')::jsonb
+                  WHEN partial.p->'wizard_plan' IS NOT NULL AND jsonb_typeof(partial.p->'wizard_plan') = 'object'
+                    THEN partial.p->'wizard_plan'
+                  ELSE NULL
+                END,
+                c.payload->'wizard_plan'
+              ),
+              true
+            ),
+            '{ai_agent1_facts}',
+            COALESCE(
+              CASE 
+                WHEN partial.p->'ai_agent1_facts' IS NOT NULL AND jsonb_typeof(partial.p->'ai_agent1_facts') = 'object'
+                  THEN partial.p->'ai_agent1_facts'
+                ELSE NULL
+              END,
+              c.payload->'ai_agent1_facts'
+            ),
+            true
+          ),
+          '{ai_agent13_rag}',
+          COALESCE(
+            CASE 
+              WHEN partial.p->'ai_agent13_rag' IS NOT NULL AND jsonb_typeof(partial.p->'ai_agent13_rag') = 'object'
+                THEN partial.p->'ai_agent13_rag'
+              WHEN partial.p->>'ai_agent13_rag' IS NOT NULL 
+                THEN to_jsonb(partial.p->>'ai_agent13_rag')
+              ELSE NULL
+            END,
+            c.payload->'ai_agent13_rag'
+          ),
+          true
+        ),
+        '{problem_description}',
+        to_jsonb(COALESCE(partial.p->>'problem_description', c.payload->>'problem_description')),
+        true
+      ),
+      '{answers_prefill}',
+      COALESCE(
+        CASE 
+          WHEN partial.p->>'answers_prefill' IS NOT NULL 
+            THEN (partial.p->>'answers_prefill')::jsonb
+          WHEN partial.p->'answers_prefill' IS NOT NULL AND jsonb_typeof(partial.p->'answers_prefill') = 'array'
+            THEN partial.p->'answers_prefill'
+          ELSE '[]'::jsonb
+        END,
+        c.payload->'answers_prefill',
+        '[]'::jsonb
+      ),
+      true
+    ),
+    updated_at = now(),
+    expires_at = now() + interval '14 days'
+  FROM partial, claim_final
+  WHERE c.id = claim_final.claim_uuid
+    AND EXISTS (SELECT 1 FROM claim_lookup WHERE claim_uuid = c.id)
+  RETURNING c.id, c.status_code, c.payload
+)
+
+SELECT
+  jsonb_build_object(
+    'claim_id', COALESCE(
+      (SELECT id::text FROM upd LIMIT 1),
+      (SELECT claim_uuid::text FROM claim_final LIMIT 1),
+      (SELECT id::text FROM claim_created LIMIT 1)
+    ),
+    'session_token', (SELECT session_token_str FROM partial LIMIT 1),
+    'status_code', COALESCE(
+      (SELECT status_code FROM upd LIMIT 1),
+      (SELECT status_code FROM claim_created LIMIT 1),
+      'draft'
+    ),
+    'payload', COALESCE(
+      (SELECT payload FROM upd LIMIT 1),
+      (SELECT payload FROM claim_created LIMIT 1),
+      jsonb_build_object()
+    )
+  ) AS claim;
+