feat(points): 实现积分流水列表功能

- 后端新增 GET /api/v1/points/ledger 接口
- 前端新增积分流水列表页面
- 积分中心添加「查看流水」入口
- 重命名 AccountDeleteScreen 为 AccountDataScreen
- 流水列表支持分页加载和空状态展示

backend/tests/unit/test_points_service_audit.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
+from datetime import datetime, timezone
 from decimal import Decimal
 from uuid import UUID, uuid4
 
@@ -22,12 +23,23 @@ class _FakeAccount:
     version: int = 0
 
 
+@dataclass
+class _FakeLedgerRow:
+    id: UUID
+    direction: int
+    amount: int
+    balance_after: int
+    change_type: str
+    created_at: datetime
+
+
 class _FakePointsRepository:
     def __init__(self, *, usage_snapshot: PointsChargeSnapshot | None) -> None:
         self.account = _FakeAccount()
         self.usage_snapshot = usage_snapshot
         self.appended_ledger: list[ApplyPointsChangeCommand] = []
         self.appended_audit: list[AppendAuditLedgerCommand] = []
+        self.ledger_rows: list[_FakeLedgerRow] = []
         self.claimed: bool = False
         self.claim: RegisterBonusClaims | None = None
 
@@ -88,6 +100,16 @@ class _FakePointsRepository:
         del email_hash
         return self.claim
 
+    async def list_ledger(
+        self,
+        *,
+        user_id: UUID,
+        limit: int,
+        cursor: datetime | None = None,
+    ) -> tuple[list[_FakeLedgerRow], bool]:
+        del user_id, cursor
+        return (self.ledger_rows[:limit], len(self.ledger_rows) > limit)
+
 
 @pytest.mark.asyncio
 async def test_consume_successful_run_points_writes_real_usage_to_audit() -> None:
@@ -225,3 +247,68 @@ async def test_grant_register_bonus_if_eligible_restores_balance_snapshot() -> N
     assert repository.claimed is False
     assert len(repository.appended_ledger) == 0
     assert len(repository.appended_audit) == 0
+
+
+@pytest.mark.asyncio
+async def test_get_ledger_list_returns_items_and_next_cursor() -> None:
+    created_at = datetime(2026, 4, 28, 8, 30, tzinfo=timezone.utc)
+    repository = _FakePointsRepository(usage_snapshot=None)
+    repository.ledger_rows = [
+        _FakeLedgerRow(
+            id=uuid4(),
+            direction=1,
+            amount=60,
+            balance_after=160,
+            change_type="purchase",
+            created_at=created_at,
+        ),
+    ]
+    service = PointsService(repository=repository)  # type: ignore[arg-type]
+
+    items, next_cursor, has_more = await service.get_ledger_list(
+        user_id=uuid4(),
+        limit=1,
+    )
+
+    assert has_more is False
+    assert next_cursor is None
+    assert len(items) == 1
+    assert items[0].amount == 60
+    assert items[0].balance_after == 160
+    assert items[0].change_type == "purchase"
+    assert items[0].created_at == created_at.isoformat()
+
+
+@pytest.mark.asyncio
+async def test_get_ledger_list_sets_next_cursor_when_more_rows_exist() -> None:
+    first_created_at = datetime(2026, 4, 28, 8, 30, tzinfo=timezone.utc)
+    second_created_at = datetime(2026, 4, 27, 8, 30, tzinfo=timezone.utc)
+    repository = _FakePointsRepository(usage_snapshot=None)
+    repository.ledger_rows = [
+        _FakeLedgerRow(
+            id=uuid4(),
+            direction=1,
+            amount=60,
+            balance_after=160,
+            change_type="purchase",
+            created_at=first_created_at,
+        ),
+        _FakeLedgerRow(
+            id=uuid4(),
+            direction=-1,
+            amount=20,
+            balance_after=140,
+            change_type="consume",
+            created_at=second_created_at,
+        ),
+    ]
+    service = PointsService(repository=repository)  # type: ignore[arg-type]
+
+    items, next_cursor, has_more = await service.get_ledger_list(
+        user_id=uuid4(),
+        limit=1,
+    )
+
+    assert has_more is True
+    assert len(items) == 1
+    assert next_cursor == first_created_at.isoformat()