diff --git a/backend/src/core/db/base_service.py b/backend/src/core/db/base_service.py
index afde80f..662d605 100644
--- a/backend/src/core/db/base_service.py
+++ b/backend/src/core/db/base_service.py
@@ -2,9 +2,8 @@ from __future__ import annotations
 
 from uuid import UUID
 
-from fastapi import HTTPException
-
 from core.auth.models import CurrentUser
+from core.http.errors import ApiProblemError, problem_payload
 
 
 class BaseService:
@@ -15,7 +14,10 @@ class BaseService:
 
     def require_current_user(self) -> CurrentUser:
         if self._current_user is None:
-            raise HTTPException(status_code=401, detail="Unauthorized")
+            raise ApiProblemError(
+                status_code=401,
+                detail=problem_payload(code="AUTH_UNAUTHORIZED", detail="Unauthorized"),
+            )
         return self._current_user
 
     def require_user_id(self) -> UUID:
diff --git a/backend/src/v1/notifications/repository.py b/backend/src/v1/notifications/repository.py
index c002225..ee702be 100644
--- a/backend/src/v1/notifications/repository.py
+++ b/backend/src/v1/notifications/repository.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from uuid import UUID
 
 from sqlalchemy.dialects.postgresql import insert
@@ -85,7 +85,7 @@ class NotificationRepository:
         if un is None:
             return False
         un.is_read = True
-        un.read_at = datetime.now()
+        un.read_at = datetime.now(timezone.utc)
         await self._session.flush()
         return True
 
diff --git a/backend/src/v1/notifications/service.py b/backend/src/v1/notifications/service.py
index 640c90e..317e7da 100644
--- a/backend/src/v1/notifications/service.py
+++ b/backend/src/v1/notifications/service.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
-from datetime import datetime
+from datetime import datetime, timezone
 from uuid import UUID
 
 from core.http.errors import ApiProblemError, problem_payload
@@ -113,7 +113,7 @@ class NotificationService:
             body=n.body,
             payload=payload,
             is_read=True,
-            read_at=un.read_at or datetime.now(),
+            read_at=un.read_at or datetime.now(timezone.utc),
             created_at=un.created_at,
         )
 
diff --git a/docs/protocols/auth/session-auth-protocol.md b/docs/protocols/auth/session-auth-protocol.md
index eb190f4..4e7bce7 100644
--- a/docs/protocols/auth/session-auth-protocol.md
+++ b/docs/protocols/auth/session-auth-protocol.md
@@ -36,6 +36,11 @@ Gateway error codes from `backend/src/v1/auth/gateway.py`:
 - `AUTH_VERIFICATION_CODE_INVALID`
 - `AUTH_REFRESH_TOKEN_INVALID`
 - `AUTH_REFRESH_TOKEN_MISSING`
+- `AUTH_USER_NOT_FOUND`
+
+Authorization error codes from `backend/src/v1/users/dependencies.py`:
+
+- `AUTH_UNAUTHORIZED`
 
 ## Frontend route mapping
 
diff --git a/docs/protocols/common/http-error-codes.md b/docs/protocols/common/http-error-codes.md
index aa1e395..479010b 100644
--- a/docs/protocols/common/http-error-codes.md
+++ b/docs/protocols/common/http-error-codes.md
@@ -83,6 +83,12 @@ This document is the source of truth for backend RFC7807 `code` values consumed
 |---|---:|---|---|
 | `NOTIFICATION_NOT_FOUND` | 404 | Notification not found or not owned by current user | Show not-found message and refresh list |
 
+## Invite
+
+| code | status | meaning | frontend handling |
+|---|---:|---|---|
+| `INVITE_CODE_NOT_FOUND` | 404 | Invite code not found for current user | Show not-found message and trigger invite code bootstrap |
+
 ## Global
 
 | code | status | meaning | frontend handling |
diff --git a/docs/protocols/common/user-points-chat-data-protocol.md b/docs/protocols/common/user-points-chat-data-protocol.md
index d978e3e..def1f73 100644
--- a/docs/protocols/common/user-points-chat-data-protocol.md
+++ b/docs/protocols/common/user-points-chat-data-protocol.md
@@ -39,12 +39,15 @@ Protocol verification status:
 ### profiles
 
 - PK: `id` (`auth.users.id`, `on delete cascade`)
-- Core fields: `username`, `avatar_url`, `bio`, `settings`, `created_at`, `updated_at`, `deleted_at`
+- Core fields: `username`, `avatar_url`, `bio`, `settings`, `referred_by`, `created_at`, `updated_at`, `deleted_at`
 - Constraints:
   - `username` not empty
 - Indexes:
   - `ix_profiles_username`
   - `ix_profiles_settings_gin`
+- Notes:
+  - `referred_by` is FK to `profiles.id` (`on delete set null`) for invite/referral tracking
+  - `settings` stores `ProfileSettingsV1` JSON including `preferences`, `privacy`, `notification`, `divination_tutorial`
 
 ### user_points
 
diff --git a/docs/protocols/divination/divination-run-protocol.md b/docs/protocols/divination/divination-run-protocol.md
index bdba8f5..a771e01 100644
--- a/docs/protocols/divination/divination-run-protocol.md
+++ b/docs/protocols/divination/divination-run-protocol.md
@@ -161,9 +161,11 @@ During run streaming, backend emits standard AG-UI lifecycle events and two divi
   "binaryCode": "101001",
   "changedBinaryCode": "100001",
   "guaName": "山火贲",
+  "guaNameHant": "山火賁",
   "upperName": "艮",
   "lowerName": "离",
   "targetGuaName": "山雷颐",
+  "targetGuaNameHant": "山雷頤",
   "worldPosition": 1,
   "responsePosition": 4,
   "hasChangingYao": true,
@@ -192,7 +194,9 @@ During run streaming, backend emits standard AG-UI lifecycle events and two divi
     {
       "position": 1,
       "spiritName": "虎",
+      "spiritNameHant": "虎",
       "relationName": "官鬼",
+      "relationNameHant": "官鬼",
       "tiganName": "卯",
       "elementName": "木",
       "isYang": true,
@@ -206,13 +210,27 @@ During run streaming, backend emits standard AG-UI lifecycle events and two divi
     {
       "position": 2,
       "relationName": "父母",
+      "relationNameHant": "父母",
       "tiganName": "午",
       "elementName": "火"
     }
-  ]
+  ],
+  "specialStatus": [],
+  "interactions": [],
+  "timeEffect": [],
+  "riChenZhangSheng": []
 }
 ```
 
+Field notes:
+
+- `guaNameHant`, `targetGuaNameHant`: Traditional Chinese variants for卦名.
+- `spiritNameHant`, `relationNameHant`: Traditional Chinese variants for六神/六亲 names.
+- `specialStatus`: Special hexagram status indicators.
+- `interactions`: 爻位 interaction descriptions.
+- `timeEffect`: Time-based effect descriptions.
+- `riChenZhangSheng`: 日辰长生相关 information.
+
 ### 2) `TEXT_MESSAGE_END`
 
 - Standard final answer event.
diff --git a/docs/protocols/invite/invite-protocol.md b/docs/protocols/invite/invite-protocol.md
new file mode 100644
index 0000000..2c0b576
--- /dev/null
+++ b/docs/protocols/invite/invite-protocol.md
@@ -0,0 +1,49 @@
+# Invite Protocol (Frontend <-> Backend)
+
+This document defines the invite code contract for authenticated users.
+
+Protocol verification status:
+
+- Backend route source: `backend/src/v1/invite/router.py`
+- Backend service source: `backend/src/v1/invite/service.py`
+- Backend schema source: `backend/src/v1/invite/schemas.py`
+- Frontend mapping source: `apps/lib/features/settings/data/apis/invite_api.dart`
+
+## Compatibility strategy
+
+- Additive evolution only.
+- Existing response fields are stable and must remain backward-compatible.
+
+## Route
+
+### GET /api/v1/invite/me
+
+Get the current user's invite code information.
+
+**Authorization**: Requires authenticated session. User identity from JWT `sub`.
+
+**Response (200)**:
+
+```json
+{
+  "code": "ABC123XYZ",
+  "used_count": 5
+}
+```
+
+Field rules:
+
+- `code`: string, unique invite code assigned to the user
+- `used_count`: integer `>= 0`, number of times this code has been used
+
+## Error contract linkage
+
+- RFC7807 + extension `code`, optional `params`.
+- Shared registry: `docs/protocols/common/http-error-codes.md`.
+- Error codes for this feature:
+  - `INVITE_CODE_NOT_FOUND` (404): Invite code not found for current user
+
+## Data model linkage
+
+- Invite codes are stored in `invite_codes` table.
+- See `docs/protocols/common/user-points-chat-data-protocol.md` for `profiles.referred_by` field.
diff --git a/docs/protocols/notification/notification-inbox-protocol.md b/docs/protocols/notification/notification-inbox-protocol.md
index 0d105ef..6300467 100644
--- a/docs/protocols/notification/notification-inbox-protocol.md
+++ b/docs/protocols/notification/notification-inbox-protocol.md
@@ -82,15 +82,15 @@ Field rules:
 - `count`: integer `>= 0`
 - Counts only notifications where `notifications.status = 'published'` and `notifications.deleted_at IS NULL`
 
-### PATCH /api/v1/notifications/{id}/read
+### PATCH /api/v1/notifications/{notification_id}/read
 
 Mark a single notification as read. Idempotent.
 
-**Authorization**: Requires authenticated session. `id` must belong to the current user's `user_notifications`.
+**Authorization**: Requires authenticated session. `notification_id` must belong to the current user's `user_notifications`.
 
 **Path parameters**:
 
-- `id`: UUID of the `user_notifications` record
+- `notification_id`: UUID of the `user_notifications` record
 
 **Response (200)**:
 
diff --git a/docs/protocols/profile/profile-protocol.md b/docs/protocols/profile/profile-protocol.md
index cddf9f4..eb8e84e 100644
--- a/docs/protocols/profile/profile-protocol.md
+++ b/docs/protocols/profile/profile-protocol.md
@@ -109,6 +109,11 @@ Request:
     "notification": {
       "allow_notifications": true,
       "allow_vibration": true
+    },
+    "divination_tutorial": {
+      "divination_entry_shown": false,
+      "auto_divination_shown": false,
+      "manual_divination_shown": false
     }
   }
 }
@@ -118,6 +123,7 @@ Rules:
 
 - `settings` must conform to `ProfileSettingsV1`.
 - Additional fields are forbidden.
+- `divination_tutorial` tracks user's tutorial completion state for divination flows.
 
 Response:
 
diff --git a/infra/docker/docker-compose.yml b/infra/docker/docker-compose.yml
index 329213c..e89e523 100644
--- a/infra/docker/docker-compose.yml
+++ b/infra/docker/docker-compose.yml
@@ -5,7 +5,7 @@ include:
 
 services:
   redis:
-    image: redis:7-alpine
+    image: redis:7.4.2-alpine
     container_name: eryao-local-redis
     restart: unless-stopped
     ports:
diff --git a/infra/docker/supabase/docker-compose.yml b/infra/docker/supabase/docker-compose.yml
index dd99eb5..1d59751 100644
--- a/infra/docker/supabase/docker-compose.yml
+++ b/infra/docker/supabase/docker-compose.yml
@@ -74,7 +74,7 @@ services:
 
   rest:
     container_name: supabase-rest
-    image: postgrest/postgrest:v14.6
+    image: postgrest/postgrest:v14.8
     restart: unless-stopped
     depends_on:
       db:
@@ -92,7 +92,7 @@ services:
 
   storage:
     container_name: supabase-storage
-    image: supabase/storage-api:v1.44.2
+    image: supabase/storage-api:v1.48.26
     restart: unless-stopped
     depends_on:
       db:
@@ -125,7 +125,7 @@ services:
 
   meta:
     container_name: supabase-meta
-    image: supabase/postgres-meta:v0.95.2
+    image: supabase/postgres-meta:v0.96.3
     restart: unless-stopped
     depends_on:
       db:
@@ -146,12 +146,19 @@ services:
 
   studio:
     container_name: supabase-studio
-    image: supabase/studio:2026.03.16-sha-5528817
+    image: supabase/studio:2026.04.08-sha-205cbe7
     restart: unless-stopped
     depends_on:
       meta:
         condition: service_healthy
+    healthcheck:
+      test: ["CMD-SHELL", "node -e \"require('http').get('http://0.0.0.0:3000/', (r) => process.exit(r.statusCode < 500 ? 0 : 1)).on('error', () => process.exit(1))\""]
+      interval: 10s
+      timeout: 10s
+      retries: 3
+      start_period: 15s
     environment:
+      HOSTNAME: "0.0.0.0"
       STUDIO_PG_META_URL: http://meta:8080
       POSTGRES_PASSWORD: ${ERYAO_DATABASE__PASSWORD}
       POSTGRES_HOST: db