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/unit/test_pool_management_scheduling_state.py

@@ -0,0 +1,128 @@
+"""Tests for pool management scheduling state assembly."""
+
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+from src.api.admin.pool.routes import (
+    _build_pool_scheduling_state,
+    _is_known_banned_key,
+    _is_known_banned_reason,
+)
+
+
+def test_pool_scheduling_state_manual_disabled_is_blocked() -> None:
+    (
+        status,
+        reason,
+        _label,
+        reasons,
+        score,
+        candidate_eligible,
+        blocked_count,
+        _degraded_count,
+        dimensions,
+    ) = _build_pool_scheduling_state(
+        is_active=False,
+        cooldown_reason=None,
+        cooldown_ttl_seconds=None,
+        circuit_breaker_open=False,
+        cost_window_usage=0,
+        cost_limit=None,
+        cost_soft_threshold_percent=80,
+        health_score=1.0,
+    )
+
+    assert status == "blocked"
+    assert reason == "manual_disabled"
+    assert candidate_eligible is False
+    assert blocked_count >= 1
+    assert score < 100
+    assert any(item.code == "manual_disabled" for item in reasons)
+    assert any(item.code == "manual_disabled" for item in dimensions)
+
+
+def test_pool_scheduling_state_cooldown_detail_is_mapped() -> None:
+    (
+        _status,
+        reason,
+        _label,
+        reasons,
+        _score,
+        _candidate_eligible,
+        _blocked_count,
+        _degraded_count,
+        dimensions,
+    ) = _build_pool_scheduling_state(
+        is_active=True,
+        cooldown_reason="rate_limited_429",
+        cooldown_ttl_seconds=180,
+        circuit_breaker_open=False,
+        cost_window_usage=0,
+        cost_limit=None,
+        cost_soft_threshold_percent=80,
+        health_score=1.0,
+    )
+
+    assert reason == "cooldown"
+    cooldown_reason = next(item for item in reasons if item.code == "cooldown")
+    cooldown_dimension = next(item for item in dimensions if item.code == "cooldown")
+    assert cooldown_reason.detail == "429 限流"
+    assert cooldown_dimension.detail == "429 限流"
+
+
+def test_pool_scheduling_state_cost_soft_is_degraded() -> None:
+    (
+        status,
+        reason,
+        _label,
+        _reasons,
+        _score,
+        candidate_eligible,
+        blocked_count,
+        degraded_count,
+        _dimensions,
+    ) = _build_pool_scheduling_state(
+        is_active=True,
+        cooldown_reason=None,
+        cooldown_ttl_seconds=None,
+        circuit_breaker_open=False,
+        cost_window_usage=85,
+        cost_limit=100,
+        cost_soft_threshold_percent=80,
+        health_score=1.0,
+    )
+
+    assert status == "degraded"
+    assert reason == "cost_soft"
+    assert candidate_eligible is True
+    assert blocked_count == 0
+    assert degraded_count >= 1
+
+
+def test_known_banned_reason_account_block_prefix() -> None:
+    assert _is_known_banned_reason("[ACCOUNT_BLOCK] Google 要求验证账号") is True
+
+
+def test_known_banned_key_detects_kiro_banned_metadata() -> None:
+    key = SimpleNamespace(
+        upstream_metadata={"kiro": {"is_banned": True}},
+        oauth_invalid_reason=None,
+    )
+    assert _is_known_banned_key(key, "kiro") is True
+
+
+def test_known_banned_key_detects_reason_keywords() -> None:
+    key = SimpleNamespace(
+        upstream_metadata={},
+        oauth_invalid_reason="AWS account temporarily suspended",
+    )
+    assert _is_known_banned_key(key, "antigravity") is True
+
+
+def test_known_banned_key_does_not_treat_token_expired_as_banned() -> None:
+    key = SimpleNamespace(
+        upstream_metadata={"kiro": {"is_banned": False}},
+        oauth_invalid_reason="access token expired",
+    )
+    assert _is_known_banned_key(key, "kiro") is False