feat(failover): 支持 Provider 级别故障转移规则，默认全部转移策略

- 新增 failover_rules 配置：支持 success_failover_patterns（成功响应匹配时转移）
  和 error_stop_patterns（错误响应匹配时终止），支持按 status_code 过滤
- 修改默认转移策略：ErrorClassifier 不再返回 RAISE，所有错误默认继续转移
- TaskService 中客户端错误不再直接抛出，改为 break 继续尝试下一个候选
- 修复 proxy tunnel 连接/断连竞态：引入 per-node 锁和事件时间戳排序
- 优化 ProxyNode 状态判定：OFFLINE 统一由心跳超时判定，兼容多 worker 场景
- has_tunnel 改为纯检查方法，避免在 finally 块中误清理新注册连接
- Redis stream NOGROUP 异常自愈处理
- OAuthAccountDialog 输入框焦点样式补全

src/api/admin/providers/routes.py

@@ -82,6 +82,32 @@ def _merge_pool_advanced_config(
     return merged_config or None, config_changed
 
 
+def _merge_failover_rules_config(
+    *,
+    provider_config: dict[str, Any] | None,
+    failover_rules: dict[str, Any] | None,
+    failover_rules_in_payload: bool,
+) -> tuple[dict[str, Any] | None, bool]:
+    """合并 failover_rules 到 provider.config。"""
+    merged_config = dict(provider_config or {})
+    config_changed = False
+
+    if not failover_rules_in_payload:
+        return merged_config or None, config_changed
+
+    if failover_rules is None:
+        if "failover_rules" in merged_config:
+            merged_config.pop("failover_rules", None)
+            config_changed = True
+    else:
+        next_value = dict(failover_rules)
+        if merged_config.get("failover_rules") != next_value:
+            merged_config["failover_rules"] = next_value
+            config_changed = True
+
+    return merged_config or None, config_changed
+
+
 def _merge_claude_code_advanced_config(
     *,
     provider_type: str | None,
@@ -394,6 +420,15 @@ class AdminCreateProviderAdapter(AdminApiAdapter):
                 ),
                 pool_advanced_in_payload=validated_data.pool_advanced is not None,
             )
+            provider_config, _ = _merge_failover_rules_config(
+                provider_config=provider_config,
+                failover_rules=(
+                    validated_data.failover_rules.model_dump()
+                    if validated_data.failover_rules is not None
+                    else None
+                ),
+                failover_rules_in_payload=validated_data.failover_rules is not None,
+            )
 
             # 创建 Provider 对象
             provider = Provider(
@@ -509,6 +544,7 @@ class AdminUpdateProviderAdapter(AdminApiAdapter):
             config_in_payload = "config" in update_data
             claude_advanced_in_payload = "claude_code_advanced" in update_data
             pool_advanced_in_payload = "pool_advanced" in update_data
+            failover_rules_in_payload = "failover_rules" in update_data
             provider_config = (
                 dict(update_data.pop("config") or {})
                 if config_in_payload
@@ -518,6 +554,9 @@ class AdminUpdateProviderAdapter(AdminApiAdapter):
                 update_data.pop("claude_code_advanced") if claude_advanced_in_payload else None
             )
             pool_advanced = update_data.pop("pool_advanced") if pool_advanced_in_payload else None
+            failover_rules = (
+                update_data.pop("failover_rules") if failover_rules_in_payload else None
+            )
             target_provider_type = (
                 update_data.get("provider_type")
                 or getattr(provider, "provider_type", None)
@@ -535,6 +574,11 @@ class AdminUpdateProviderAdapter(AdminApiAdapter):
                 pool_advanced=pool_advanced,
                 pool_advanced_in_payload=pool_advanced_in_payload,
             )
+            provider_config, config_changed_by_failover = _merge_failover_rules_config(
+                provider_config=provider_config,
+                failover_rules=failover_rules,
+                failover_rules_in_payload=failover_rules_in_payload,
+            )
 
             config_touched = (
                 config_in_payload
@@ -542,6 +586,8 @@ class AdminUpdateProviderAdapter(AdminApiAdapter):
                 or config_changed_by_claude
                 or pool_advanced_in_payload
                 or config_changed_by_pool
+                or failover_rules_in_payload
+                or config_changed_by_failover
             )
             if config_touched:
                 update_data["config"] = provider_config

src/api/admin/providers/summary.py

@@ -18,7 +18,11 @@ from src.core.enums import ProviderBillingType
 from src.core.exceptions import InvalidRequestException, NotFoundException
 from src.core.logger import logger
 from src.database import get_db
-from src.models.admin_requests import ClaudeCodeAdvancedConfig, PoolAdvancedConfig
+from src.models.admin_requests import (
+    ClaudeCodeAdvancedConfig,
+    FailoverRulesConfig,
+    PoolAdvancedConfig,
+)
 from src.models.database import (
     Model,
     Provider,
@@ -282,6 +286,38 @@ def _extract_claude_code_advanced_from_config(
         return None
 
 
+def _extract_failover_rules_from_config(
+    provider_config: dict[str, Any] | None,
+    *,
+    provider_id: str,
+) -> FailoverRulesConfig | None:
+    """从 Provider.config 中安全提取故障转移规则配置。"""
+    raw = (provider_config or {}).get("failover_rules")
+    if raw is None:
+        return None
+
+    if isinstance(raw, FailoverRulesConfig):
+        return raw
+
+    if not isinstance(raw, dict):
+        logger.warning(
+            "Provider {} 的 failover_rules 类型无效: {}，已忽略",
+            provider_id,
+            type(raw).__name__,
+        )
+        return None
+
+    try:
+        return FailoverRulesConfig.model_validate(raw)
+    except Exception as exc:
+        logger.warning(
+            "Provider {} 的 failover_rules 配置无效，已忽略: {}",
+            provider_id,
+            str(exc),
+        )
+        return None
+
+
 def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndpointsSummary:
     endpoints = db.query(ProviderEndpoint).filter(ProviderEndpoint.provider_id == provider.id).all()
 
@@ -402,6 +438,10 @@ def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndp
         provider_config,
         provider_id=str(provider.id),
     )
+    failover_rules = _extract_failover_rules_from_config(
+        provider_config,
+        provider_id=str(provider.id),
+    )
 
     return ProviderWithEndpointsSummary(
         id=provider.id,
@@ -425,6 +465,7 @@ def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndp
         request_timeout=provider.request_timeout,
         claude_code_advanced=claude_code_advanced,
         pool_advanced=pool_advanced,
+        failover_rules=failover_rules,
         total_endpoints=total_endpoints,
         active_endpoints=active_endpoints,
         total_keys=total_keys,