fix(provider): 避免重复增加provider使用计数

当从provider池重新选择服务时跳过usageCount增加，因为初次选择时已经增加过。同时优化token刷新逻辑，合并强制刷新和即将过期的检查条件。

src/common.js

@@ -395,9 +395,10 @@ export async function handleContentGenerationRequest(req, res, service, endpoint
     console.log(`[Content Generation] Model: ${model}, Stream: ${isStream}`);
 
     // 2.5. 如果使用了提供商池，根据模型重新选择提供商
+    // 注意：这里使用 skipUsageCount: true，因为初次选择时已经增加了 usageCount
     if (providerPoolManager && CONFIG.providerPools && CONFIG.providerPools[CONFIG.MODEL_PROVIDER]) {
         const { getApiService } = await import('./service-manager.js');
-        service = await getApiService(CONFIG, model);
+        service = await getApiService(CONFIG, model, { skipUsageCount: true });
         console.log(`[Content Generation] Re-selected service adapter based on model: ${model}`);
     }
 

src/gemini/antigravity-core.js

@@ -249,11 +249,12 @@ export class AntigravityApiService {
     }
     
     async initializeAuth(forceRefresh = false) {
-        if (this.authClient.credentials.access_token && !forceRefresh) {
+        // 检查是否需要刷新 Token
-            // 检查 Token 是否即将过期
+        const needsRefresh = forceRefresh || this.isTokenExpiringSoon();
-            if (!this.isTokenExpiringSoon()) {
+        
-                return;
+        if (this.authClient.credentials.access_token && !needsRefresh) {
-            }
+            // Token 有效且不需要刷新
+            return;
         }
         
         // Antigravity 不支持 base64 配置，直接使用文件路径
@@ -265,13 +266,13 @@ export class AntigravityApiService {
             this.authClient.setCredentials(credentials);
             console.log('[Antigravity Auth] Authentication configured successfully from file.');
             
-            if (forceRefresh) {
+            if (needsRefresh) {
-                console.log('[Antigravity Auth] Forcing token refresh...');
+                console.log('[Antigravity Auth] Token expiring soon or force refresh requested. Refreshing token...');
                 const { credentials: newCredentials } = await this.authClient.refreshAccessToken();
                 this.authClient.setCredentials(newCredentials);
-                // 保存刷新后的凭证
+                // 保存刷新后的凭证到文件
                 await fs.writeFile(credPath, JSON.stringify(newCredentials, null, 2));
-                console.log('[Antigravity Auth] Token refreshed and saved successfully.');
+                console.log(`[Antigravity Auth] Token refreshed and saved to ${credPath} successfully.`);
             }
         } catch (error) {
             console.error('[Antigravity Auth] Error initializing authentication:', error.code);

src/provider-pool-manager.js

@@ -98,7 +98,7 @@ export class ProviderPoolManager {
      * @param {string} [requestedModel] - Optional. The model name to filter providers by.
      * @returns {object|null} The selected provider's configuration, or null if no healthy provider is found.
      */
-    selectProvider(providerType, requestedModel = null) {
+    selectProvider(providerType, requestedModel = null, options = {}) {
         // 参数校验
         if (!providerType || typeof providerType !== 'string') {
             this._log('error', `Invalid providerType: ${providerType}`);
@@ -147,14 +147,15 @@ export class ProviderPoolManager {
         // 更新下次轮询的索引
         this.roundRobinIndex[indexKey] = (currentIndex + 1) % availableAndHealthyProviders.length;
         
-        // 更新使用信息
+        // 更新使用信息（除非明确跳过）
-        selected.config.lastUsed = new Date().toISOString();
+        if (!options.skipUsageCount) {
-        selected.config.usageCount++;
+            selected.config.lastUsed = new Date().toISOString();
+            selected.config.usageCount++;
+            // 使用防抖保存
+            this._debouncedSave(providerType);
+        }
 
-        this._log('debug', `Selected provider for ${providerType} (round-robin): ${selected.config.uuid}${requestedModel ? ` for model: ${requestedModel}` : ''}`);
+        this._log('debug', `Selected provider for ${providerType} (round-robin): ${selected.config.uuid}${requestedModel ? ` for model: ${requestedModel}` : ''}${options.skipUsageCount ? ' (skip usage count)' : ''}`);
-        
-        // 使用防抖保存
-        this._debouncedSave(providerType);
         
         return selected.config;
     }

src/service-manager.js

@@ -60,13 +60,15 @@ export async function initApiService(config) {
  * Get API service adapter, considering provider pools
  * @param {Object} config - The current request configuration
  * @param {string} [requestedModel] - Optional. The model name to filter providers by.
+ * @param {Object} [options] - Optional. Additional options.
+ * @param {boolean} [options.skipUsageCount] - Optional. If true, skip incrementing usage count.
  * @returns {Promise<Object>} The API service adapter
  */
-export async function getApiService(config, requestedModel = null) {
+export async function getApiService(config, requestedModel = null, options = {}) {
     let serviceConfig = config;
     if (providerPoolManager && config.providerPools && config.providerPools[config.MODEL_PROVIDER]) {
         // 如果有号池管理器，并且当前模型提供者类型有对应的号池，则从号池中选择一个提供者配置
-        const selectedProviderConfig = providerPoolManager.selectProvider(config.MODEL_PROVIDER, requestedModel);
+        const selectedProviderConfig = providerPoolManager.selectProvider(config.MODEL_PROVIDER, requestedModel, options);
         if (selectedProviderConfig) {
             // 合并选中的提供者配置到当前请求的 config 中
             serviceConfig = deepmerge(config, selectedProviderConfig);