perf: 优化请求鉴权链路并批量化统计/调度查询

- 为 Pipeline/Context 增加按需读取请求体能力，支持 async 懒加载 JSON body
- 为 chat/cli/video/claude/openai-cli 适配器关闭默认预读，减少无效 body 读取与超时风险
- 将本地登录、JWT 用户加载、API Key 鉴权迁移到线程池隔离会话执行，避免阻塞事件循环
- 为 API Key 鉴权返回结构化余额结果，并在主请求会话中重新绑定 user/api_key 后再校验状态、过期和锁定信息
- 为 management/user token 前缀认证引入独立会话与结果回绑，避免跨会话对象写入失效

- 为 Usage 余额检查补充结构化返回，统一透出 remaining 与欠费/不可用文案映射
- 为用户与管理端活跃请求查询增加 maintain_status 开关，避免轮询指定 id 时误触发状态修复
- 重写 user_me usage 汇总逻辑，支持 group_by=None 的粗粒度聚合
- 修正 provider 维度成功率与平均响应时间统计，基于 success_count 和成功响应耗时汇总计算
- 前端 Usage 轮询由 setInterval 改为串行 setTimeout，避免并发轮询叠加

- 为 StatsAggregator 增加按本地日期批量计算百分位能力，替代逐天 fan-out 查询
- 为混合统计查询合并连续实时日期区间，并批量读取 StatsDaily，减少逐日查询次数
- 为用户日统计增加批量聚合入口，替代逐用户循环聚合
- 为系统配置导出改用 selectinload 预加载 provider 关联数据，减少 N+1 查询
- 为管理员用户列表增加钱包批量查询，避免逐用户回表

- 为调度器增加 provider 轻量引用预过滤，先按 allowed_providers 缩小范围再加载完整 provider 图
- 为 CandidateBuilder 增加 provider refs/provider_ids 查询能力，保留分页顺序
- 为模型缓存增加 provider_model_mappings 索引缓存与 model_mappings 规则缓存，减少重复全量扫描
- 为请求候选中间态改为 flush/batch commit，降低 pending/streaming 状态切换的事务往返
- 为钱包访问结果补充 balance_snapshot，并抽取余额快照复用逻辑

- 补充 pipeline、auth、admin users、user_me usage、stats aggregator、model cache、
  scheduler、wallet、request candidate 等回归与契约测试

tests/api/test_user_me_usage_routes.py

@@ -0,0 +1,175 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+from unittest.mock import MagicMock
+
+import pytest
+
+from src.api.user_me.routes import GetUsageAdapter
+from src.core.enums import UserRole
+
+
+@pytest.mark.asyncio
+async def test_get_usage_adapter_uses_coarse_summary_grouping(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    db = MagicMock()
+    query = MagicMock()
+    count_query = MagicMock()
+    count_query.scalar.return_value = 0
+    query.outerjoin.return_value = query
+    query.filter.return_value = query
+    query.with_entities.return_value = count_query
+    query.options.return_value = query
+    query.order_by.return_value = query
+    query.offset.return_value = query
+    query.limit.return_value = query
+    query.all.return_value = []
+    db.query.return_value = query
+
+    summary_getter = MagicMock(
+        return_value=[
+            {
+                "provider": "provider-a",
+                "model": "gpt-4o",
+                "requests": 2,
+                "input_tokens": 10,
+                "output_tokens": 5,
+                "total_tokens": 15,
+                "total_cost_usd": 1.5,
+                "actual_total_cost_usd": 1.2,
+                "success_count": 2,
+                "success_response_time_sum_ms": 1000.0,
+                "success_response_time_count": 2,
+            },
+            {
+                "provider": "pending",
+                "model": "gpt-4o",
+                "requests": 99,
+                "input_tokens": 999,
+                "output_tokens": 999,
+                "total_tokens": 1998,
+                "total_cost_usd": 9.9,
+                "actual_total_cost_usd": 9.9,
+                "success_count": 0,
+                "success_response_time_sum_ms": 0.0,
+                "success_response_time_count": 0,
+            },
+        ]
+    )
+    monkeypatch.setattr("src.api.user_me.routes.UsageService.get_usage_summary", summary_getter)
+    monkeypatch.setattr("src.api.user_me.routes.WalletService.get_wallet", lambda *_a, **_k: None)
+    monkeypatch.setattr(
+        "src.api.user_me.routes.WalletService.serialize_wallet_summary",
+        lambda _wallet: {"limit_mode": "finite"},
+    )
+
+    adapter = GetUsageAdapter(time_range=None, limit=20, offset=0)
+    context = SimpleNamespace(
+        db=db,
+        user=SimpleNamespace(id="user-1", role=UserRole.USER),
+        request=SimpleNamespace(state=SimpleNamespace()),
+    )
+
+    result = await adapter.handle(context)
+
+    assert result["total_requests"] == 2
+    assert result["total_tokens"] == 15
+    assert result["summary_by_model"] == [
+        {
+            "model": "gpt-4o",
+            "requests": 2,
+            "input_tokens": 10,
+            "output_tokens": 5,
+            "total_tokens": 15,
+            "total_cost_usd": 1.5,
+        }
+    ]
+    assert "total_actual_cost" not in result
+    assert result["summary_by_provider"] == [
+        {
+            "provider": "provider-a",
+            "requests": 2,
+            "total_tokens": 15,
+            "total_cost_usd": 1.5,
+            "success_rate": 100.0,
+            "avg_response_time_ms": 500.0,
+        }
+    ]
+    assert summary_getter.call_args.kwargs["group_by"] is None
+
+
+@pytest.mark.asyncio
+async def test_get_usage_adapter_provider_success_rate_uses_success_count(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    db = MagicMock()
+    query = MagicMock()
+    count_query = MagicMock()
+    count_query.scalar.return_value = 0
+    query.outerjoin.return_value = query
+    query.filter.return_value = query
+    query.with_entities.return_value = count_query
+    query.options.return_value = query
+    query.order_by.return_value = query
+    query.offset.return_value = query
+    query.limit.return_value = query
+    query.all.return_value = []
+    db.query.return_value = query
+
+    summary_getter = MagicMock(
+        return_value=[
+            {
+                "provider": "provider-a",
+                "model": "gpt-4o",
+                "requests": 3,
+                "input_tokens": 30,
+                "output_tokens": 15,
+                "total_tokens": 45,
+                "total_cost_usd": 4.5,
+                "actual_total_cost_usd": 4.5,
+                "success_count": 2,
+                "success_response_time_sum_ms": 600.0,
+                "success_response_time_count": 2,
+            },
+            {
+                "provider": "provider-a",
+                "model": "gpt-4.1",
+                "requests": 1,
+                "input_tokens": 10,
+                "output_tokens": 5,
+                "total_tokens": 15,
+                "total_cost_usd": 1.5,
+                "actual_total_cost_usd": 1.5,
+                "success_count": 0,
+                "success_response_time_sum_ms": 0.0,
+                "success_response_time_count": 0,
+            },
+        ]
+    )
+    monkeypatch.setattr("src.api.user_me.routes.UsageService.get_usage_summary", summary_getter)
+    monkeypatch.setattr("src.api.user_me.routes.WalletService.get_wallet", lambda *_a, **_k: None)
+    monkeypatch.setattr(
+        "src.api.user_me.routes.WalletService.serialize_wallet_summary",
+        lambda _wallet: {"limit_mode": "finite"},
+    )
+
+    adapter = GetUsageAdapter(time_range=None, limit=20, offset=0)
+    context = SimpleNamespace(
+        db=db,
+        user=SimpleNamespace(id="user-1", role=UserRole.USER),
+        request=SimpleNamespace(state=SimpleNamespace()),
+    )
+
+    result = await adapter.handle(context)
+
+    assert result["summary_by_provider"] == [
+        {
+            "provider": "provider-a",
+            "requests": 4,
+            "total_tokens": 60,
+            "total_cost_usd": 6.0,
+            "success_rate": 50.0,
+            "avg_response_time_ms": 300.0,
+        }
+    ]