fix: 防止流式响应中重复发送结束标志并添加新模型支持

修复 handleStreamRequest 中可能重复发送流结束标志的问题，新增 hasMessageStop 状态跟踪。
在 provider-pool-manager 中修复临时配置缺少全局配置的问题。
为 Gemini 提供者添加新的模型支持：gemini-claude-opus-4-6-thinking。

src/providers/gemini/antigravity-core.js

@@ -66,7 +66,8 @@ const MODEL_ALIAS_MAP = {
     'gemini-2.5-flash-preview': 'gemini-2.5-flash',
     'gemini-claude-sonnet-4-5': 'claude-sonnet-4-5',
     'gemini-claude-sonnet-4-5-thinking': 'claude-sonnet-4-5-thinking',
-    'gemini-claude-opus-4-5-thinking': 'claude-opus-4-5-thinking'
+    'gemini-claude-opus-4-5-thinking': 'claude-opus-4-5-thinking',
+    'gemini-claude-opus-4-6-thinking': 'claude-opus-4-6-thinking'
 };
 
 // 真实模型名 -> 别名
@@ -78,7 +79,8 @@ const MODEL_NAME_MAP = {
     'gemini-2.5-flash': 'gemini-2.5-flash-preview',
     'claude-sonnet-4-5': 'gemini-claude-sonnet-4-5',
     'claude-sonnet-4-5-thinking': 'gemini-claude-sonnet-4-5-thinking',
-    'claude-opus-4-5-thinking': 'gemini-claude-opus-4-5-thinking'
+    'claude-opus-4-5-thinking': 'gemini-claude-opus-4-5-thinking',
+    'claude-opus-4-6-thinking': 'gemini-claude-opus-4-6-thinking'
 };
 
 /**

src/providers/provider-models.js

@@ -21,7 +21,8 @@ export const PROVIDER_MODELS = {
         'gemini-2.5-flash-preview',
         'gemini-claude-sonnet-4-5',
         'gemini-claude-sonnet-4-5-thinking',
-        'gemini-claude-opus-4-5-thinking'
+        'gemini-claude-opus-4-5-thinking',
+        'gemini-claude-opus-4-6-thinking'
     ],
     'claude-custom': [],
     'claude-kiro-oauth': [

src/providers/provider-pool-manager.js

@@ -379,6 +379,7 @@ export class ProviderPoolManager {
 
             // 使用适配器进行刷新
             const tempConfig = {
+                ...this.globalConfig,
                 ...config,
                 MODEL_PROVIDER: providerType
             };

src/utils/common.js

@@ -322,6 +322,7 @@ export async function handleStreamRequest(res, service, model, requestBody, from
     const addEvent = getProtocolPrefix(fromProvider) === MODEL_PROTOCOL_PREFIX.CLAUDE || getProtocolPrefix(fromProvider) === MODEL_PROTOCOL_PREFIX.OPENAI_RESPONSES;
 
     let hasToolCall = false;
+    let hasMessageStop = false; // 跟踪是否已经发送过结束标志（message_stop / done）
 
     try {
         for await (const nativeChunk of nativeStream) {
@@ -399,6 +400,20 @@ export async function handleStreamRequest(res, service, model, requestBody, from
                     }
                 }
 
+                // 防止重复发送结束标志
+                // OpenAI: choices[].finish_reason
+                // Claude: message_stop
+                // OpenAI Responses: done
+                // Gemini: candidates[].finishReason（如 STOP / MAX_TOKENS / SAFETY 等）
+                if (
+                    chunk?.choices?.some(choice => choice?.finish_reason) ||
+                    chunk?.type === 'message_stop' ||
+                    chunk?.type === 'done' ||
+                    chunk?.candidates?.some(candidate => candidate?.finishReason)
+                ) {
+                    hasMessageStop = true;
+                }
+
                 if (addEvent) {
                     // fullOldResponseJson += chunk.type+"\n";
                     // fullResponseJson += chunk.type+"\n";
@@ -574,13 +589,27 @@ export async function handleStreamRequest(res, service, model, requestBody, from
             if (!res.writableEnded) {
                 try {
                     if (clientProtocol === MODEL_PROTOCOL_PREFIX.OPENAI) {
-                        res.write('data: [DONE]\n\n');
+                        if (!hasMessageStop) {
+                            res.write('data: [DONE]\n\n');
+                            hasMessageStop = true;
+                        }
                     } else if (clientProtocol === MODEL_PROTOCOL_PREFIX.OPENAI_RESPONSES) {
-                        res.write('event: done\n');
+                        if (!hasMessageStop) {
-                        res.write('data: {}\n\n');
+                            res.write('event: done\n');
+                            res.write('data: {}\n\n');
+                            hasMessageStop = true;
+                        }
                     } else if (clientProtocol === MODEL_PROTOCOL_PREFIX.CLAUDE) {
-                        res.write('event: message_stop\n');
+                        if (!hasMessageStop) {
-                        res.write('data: {"type":"message_stop"}\n\n');
+                            res.write('event: message_stop\n');
+                            res.write('data: {"type":"message_stop"}\n\n');
+                            hasMessageStop = true;
+                        }
+                    } else if (clientProtocol === MODEL_PROTOCOL_PREFIX.GEMINI) {
+                        if (!hasMessageStop) {
+                            res.write('data: {"candidates":[{"finishReason":"STOP"}]}\n\n');
+                            hasMessageStop = true;
+                        }
                     }
                     res.end();
                 } catch (writeErr) {