feat(pool,scheduling): 号池调度维度、配额冷却机制与管理后台重构

- 新增 scheduling_dimensions 模块，为每个 Key 计算多维调度状态(手动/冷却/熔断/成本/健康)
- 新增 quota_cooldown 模块，统一判定 Key 的有效冷却原因
- Pool 管理后台 API 扩展 Key 详情字段(调度状态/维度/配额/OAuth 信息)
- 前端 Pool 管理页面重写，支持调度状态展示、批量清理封禁 Key
- Handler 基类增加请求调度元数据采集，stream telemetry 增强
- 请求时间线组件增强，支持 attempted 候选展示
- Kiro OAuth 凭证导入解析改进
- 新增 usage 表 provider_key 索引迁移
- 补充调度维度、配额冷却、候选枚举等单元测试

Closes #197

Co-authored-by: AAEE86 <33052466+AAEE86@users.noreply.github.com>

tests/services/test_pool_scheduling_dimensions.py

@@ -0,0 +1,94 @@
+"""Tests for pool scheduling dimension evaluation."""
+
+from __future__ import annotations
+
+from src.services.provider.pool.scheduling_dimensions import (
+    PoolSchedulingDimensionResult,
+    PoolSchedulingSnapshot,
+    evaluate_pool_scheduling_dimensions,
+    list_pool_scheduling_dimensions,
+    summarize_pool_scheduling_dimensions,
+)
+
+
+def _snapshot(**overrides: object) -> PoolSchedulingSnapshot:
+    base = {
+        "is_active": True,
+        "cooldown_reason": None,
+        "cooldown_ttl_seconds": None,
+        "circuit_breaker_open": False,
+        "cost_window_usage": 1200,
+        "cost_limit": 10000,
+        "cost_soft_threshold_percent": 80,
+        "health_score": 0.95,
+    }
+    base.update(overrides)
+    return PoolSchedulingSnapshot(**base)  # type: ignore[arg-type]
+
+
+def test_default_dimension_registry_contains_core_dimensions() -> None:
+    names = list_pool_scheduling_dimensions()
+    assert names == ("manual", "cooldown", "circuit", "cost", "health")
+
+
+def test_summary_available_when_all_dimensions_ok() -> None:
+    dimensions = evaluate_pool_scheduling_dimensions(_snapshot())
+    summary = summarize_pool_scheduling_dimensions(dimensions)
+
+    assert summary.status == "available"
+    assert summary.reason == "available"
+    assert summary.candidate_eligible is True
+    assert summary.blocked_count == 0
+    assert summary.degraded_count == 0
+    assert summary.score == 100.0
+
+
+def test_summary_blocked_when_manual_disabled() -> None:
+    dimensions = evaluate_pool_scheduling_dimensions(_snapshot(is_active=False))
+    summary = summarize_pool_scheduling_dimensions(dimensions)
+
+    assert summary.status == "blocked"
+    assert summary.reason == "manual_disabled"
+    assert summary.candidate_eligible is False
+    assert summary.blocked_count >= 1
+    assert summary.score < 100.0
+
+
+def test_summary_degraded_when_cost_reaches_soft_threshold() -> None:
+    dimensions = evaluate_pool_scheduling_dimensions(
+        _snapshot(cost_window_usage=8200, cost_limit=10000, cost_soft_threshold_percent=80)
+    )
+    summary = summarize_pool_scheduling_dimensions(dimensions)
+
+    assert summary.status == "degraded"
+    assert summary.reason == "cost_soft"
+    assert summary.candidate_eligible is True
+    assert summary.blocked_count == 0
+    assert summary.degraded_count >= 1
+
+
+def test_summary_blocked_on_cooldown_even_if_other_dimensions_ok() -> None:
+    dimensions = evaluate_pool_scheduling_dimensions(
+        _snapshot(cooldown_reason="rate_limited_429", cooldown_ttl_seconds=120)
+    )
+    summary = summarize_pool_scheduling_dimensions(dimensions)
+
+    assert summary.status == "blocked"
+    assert summary.reason == "cooldown"
+    assert summary.candidate_eligible is False
+    assert summary.blocked_count >= 1
+
+
+def test_empty_summary_defaults_to_available() -> None:
+    summary = summarize_pool_scheduling_dimensions([])
+    assert summary.status == "available"
+    assert summary.reason == "available"
+    assert summary.score == 100.0
+
+
+def test_dimension_result_keeps_degraded_health_details() -> None:
+    dimensions = evaluate_pool_scheduling_dimensions(_snapshot(health_score=0.65))
+    health = next((item for item in dimensions if item.code == "health_degraded"), None)
+    assert isinstance(health, PoolSchedulingDimensionResult)
+    assert health.status == "degraded"
+    assert health.detail == "0.65"