feat: add shared fund quote capability

tests/unit/service/test_fund_quote_cache.py

@@ -0,0 +1,53 @@
+from datetime import UTC, datetime
+from decimal import Decimal
+
+import pytest
+
+from app.core.fund_contracts import FundQuoteQuery
+from app.infrastructure.fund_quote_cache import FundQuoteCache
+from app.infrastructure.memory_cache import CacheReadResult
+from app.service.fund_quote_service import FundQuoteService
+
+
+class MemoryClient:
+    def __init__(self) -> None:
+        self.values: dict[str, str] = {}
+        self.ttls: dict[str, int] = {}
+
+    async def get(self, key: str) -> CacheReadResult:
+        return CacheReadResult(self.values.get(key))
+
+    async def set(self, key: str, value: str, ttl_seconds: int) -> bool:
+        self.values[key] = value
+        self.ttls[key] = ttl_seconds
+        return True
+
+
+class Adapter:
+    calls = 0
+
+    async def fetch_names(self, codes: list[str]) -> dict[str, str]:
+        self.calls += 1
+        return {code: "测试基金" for code in codes}
+
+    async def fetch_quotes(self, codes: list[str]) -> dict[str, dict[str, object]]:
+        self.calls += 1
+        return {code: {"nav": Decimal("1.2")} for code in codes}
+
+    async def fetch_history(self, code: str, target_date: object) -> dict[str, object]:
+        self.calls += 1
+        return {"nav": Decimal("1.1"), "nav_date": target_date, "degraded": False}
+
+
+@pytest.mark.asyncio
+async def test_service_reads_and_writes_cache() -> None:
+    client = MemoryClient()
+    adapter = Adapter()
+    service = FundQuoteService(adapter, FundQuoteCache(client))
+    query = FundQuoteQuery(fund_codes=("159511",))
+    first = await service.query(query, now=datetime(2026, 9, 9, 8, tzinfo=UTC))
+    second = await service.query(query, now=datetime(2026, 9, 9, 8, tzinfo=UTC))
+    assert first[0].quote_source == "eastmoney"
+    assert second[0].quote_source == "cache"
+    assert adapter.calls == 2
+    assert next(iter(client.ttls.values())) == 900