feat(ui): 优化熔断状态显示和健康度格式

- 健康度格式统一为 0-1 小数格式（前后端同步）
- 添加熔断倒计时显示，支持实时更新
- 新增 useCountdownTimer composable 用于倒计时逻辑
- 添加 Key 健康恢复功能（按 API 格式恢复）
- 优化 UI 布局：简化链路预览标题、调整 Key 信息为两行显示
- 修复错误处理顺序（先刷新数据再显示成功提示）
- 减少模板中函数重复调用

src/api/admin/models/routing.py

@@ -47,7 +47,7 @@ class RoutingKeyInfo(BaseModel):
     is_adaptive: bool = Field(False, description="是否为自适应 RPM 模式")
     effective_rpm: Optional[int] = Field(None, description="有效 RPM 限制")
     cache_ttl_minutes: int = Field(0, description="缓存 TTL（分钟）")
-    health_score: float = Field(100.0, description="健康度分数")
+    health_score: float = Field(1.0, description="健康度分数（0-1 小数格式）")
     is_active: bool
     api_formats: List[str] = Field(default_factory=list, description="支持的 API 格式")
     # 模型白名单
@@ -55,6 +55,7 @@ class RoutingKeyInfo(BaseModel):
     # 熔断状态
     circuit_breaker_open: bool = Field(False, description="熔断器是否打开")
     circuit_breaker_formats: List[str] = Field(default_factory=list, description="熔断的 API 格式列表")
+    next_probe_at: Optional[str] = Field(None, description="下次探测时间（ISO格式）")
 
     model_config = ConfigDict(from_attributes=True)
 
@@ -272,11 +273,11 @@ class AdminGetModelRoutingPreviewAdapter(AdminApiAdapter):
                     if is_adaptive and key.learned_rpm_limit:
                         effective_rpm = key.learned_rpm_limit
 
-                    # 从 health_by_format 获取健康度
-                    health_score = 100.0
+                    # 从 health_by_format 获取健康度（0-1 小数格式）
+                    health_score = 1.0
                     if key.health_by_format and ep.api_format:
                         format_health = key.health_by_format.get(ep.api_format, {})
-                        health_score = format_health.get("health_score", 100.0)
+                        health_score = format_health.get("health_score", 1.0)
 
                     # 生成脱敏 SK（先解密再脱敏）
                     masked_key = ""
@@ -296,11 +297,17 @@ class AdminGetModelRoutingPreviewAdapter(AdminApiAdapter):
                     # 检查熔断状态
                     circuit_breaker_open = False
                     circuit_breaker_formats: List[str] = []
+                    next_probe_at: Optional[str] = None
                     if key.circuit_breaker_by_format:
                         for fmt, cb_state in key.circuit_breaker_by_format.items():
                             if isinstance(cb_state, dict) and cb_state.get("open"):
                                 circuit_breaker_open = True
                                 circuit_breaker_formats.append(fmt)
+                                # 取最早的探测时间
+                                fmt_next_probe = cb_state.get("next_probe_at")
+                                if fmt_next_probe:
+                                    if next_probe_at is None or fmt_next_probe < next_probe_at:
+                                        next_probe_at = fmt_next_probe
 
                     # 解析 allowed_models
                     # 语义说明：
@@ -334,6 +341,7 @@ class AdminGetModelRoutingPreviewAdapter(AdminApiAdapter):
                             allowed_models=allowed_models_list,
                             circuit_breaker_open=circuit_breaker_open,
                             circuit_breaker_formats=circuit_breaker_formats,
+                            next_probe_at=next_probe_at,
                         )
                     )