fix: 修复请求失败不触发熔断机制并补充缺失参数

- 请求失败时增加 error_count 并触发熔断（达到阈值标记账户为不可用）
- 请求成功时重置 error_count 和 is_available 状态
- 补充 MAX_ACCOUNT_SWITCH_TRIES 到前端环境变量显示

core/templates.py

@@ -513,6 +513,10 @@ def generate_admin_html(request: Request, multi_account_mgr, show_hide_tip: bool
                                     <div><div class="env-name">MAX_REQUEST_RETRIES</div><div class="env-desc">请求失败重试次数</div></div>
                                     <div class="env-value">{main.MAX_REQUEST_RETRIES}</div>
                                 </div>
+                                <div class="env-var">
+                                    <div><div class="env-name">MAX_ACCOUNT_SWITCH_TRIES</div><div class="env-desc">每次重试查找账户次数</div></div>
+                                    <div class="env-value">{main.MAX_ACCOUNT_SWITCH_TRIES}</div>
+                                </div>
                                 <div class="env-var">
                                     <div><div class="env-name">ACCOUNT_FAILURE_THRESHOLD</div><div class="env-desc">账户失败阈值</div></div>
                                     <div class="env-value">{main.ACCOUNT_FAILURE_THRESHOLD} 次</div>

main.py

@@ -1385,12 +1385,23 @@ async def chat(
                     request
                 ):
                     yield chunk
+
+                # 请求成功，重置账户失败计数
+                account_manager.is_available = True
+                account_manager.error_count = 0
                 break
 
             except (httpx.ConnectError, httpx.ReadTimeout, ssl.SSLError, HTTPException) as e:
                 # 记录当前失败的账户
                 failed_accounts.add(account_manager.config.account_id)
 
+                # 增加账户失败计数（触发熔断机制）
+                account_manager.last_error_time = time.time()
+                account_manager.error_count += 1
+                if account_manager.error_count >= ACCOUNT_FAILURE_THRESHOLD:
+                    account_manager.is_available = False
+                    logger.error(f"[ACCOUNT] [{account_manager.config.account_id}] [req_{request_id}] 请求连续失败{account_manager.error_count}次，账户已标记为不可用")
+
                 retry_count += 1
 
                 # 详细记录错误信息