feat: 新增请求超时配置及优化模型列表接口api_key获取方式

1. 新增功能：
   - 在`.env.example`中添加`TIME_OUT=300`配置项（包含中文注释）
   - 在`Settings`类中增加`TIME_OUT`字段（读取自`DEFAULT_TIMEOUT`）

2. 优化内容：
   - 生成配置：
     * 为`GenerationConfig`设置默认温度/TOP_P/TOP_K值
     * 移除`maxOutputTokens`默认值，改为可选传递
   - OpenAI请求：
     * 移除`max_tokens`默认值
     * 只有当`max_tokens`有值时才添加到请求payload
   - 日志优化：
     * 注释掉`stream_optimizer.py`中部分调试日志

3. 模型列表接口api_key获取方式

app/domain/gemini_models.py

@@ -1,6 +1,8 @@
 from typing import List, Optional, Dict, Any, Literal, Union
 from pydantic import BaseModel
 
+from app.core.constants import DEFAULT_TEMPERATURE, DEFAULT_TOP_K, DEFAULT_TOP_P
+
 
 class SafetySetting(BaseModel):
     category: Optional[Literal["HARM_CATEGORY_HATE_SPEECH", "HARM_CATEGORY_DANGEROUS_CONTENT", "HARM_CATEGORY_HARASSMENT", "HARM_CATEGORY_SEXUALLY_EXPLICIT", "HARM_CATEGORY_CIVIC_INTEGRITY"]] = None
@@ -13,9 +15,9 @@ class GenerationConfig(BaseModel):
     responseSchema: Optional[Dict[str, Any]] = None
     candidateCount: Optional[int] = 1
     maxOutputTokens: Optional[int] = None
-    temperature: Optional[float] = None
-    topP: Optional[float] = None
-    topK: Optional[int] = None
+    temperature: Optional[float] = DEFAULT_TEMPERATURE
+    topP: Optional[float] = DEFAULT_TOP_P
+    topK: Optional[int] = DEFAULT_TOP_K
     presencePenalty: Optional[float] = None
     frequencyPenalty: Optional[float] = None
     responseLogprobs: Optional[bool] = None

app/domain/openai_models.py

@@ -1,7 +1,7 @@
 from pydantic import BaseModel
 from typing import List, Optional, Union
 
-from app.core.constants import DEFAULT_MAX_TOKENS, DEFAULT_MODEL, DEFAULT_TEMPERATURE, DEFAULT_TOP_K, DEFAULT_TOP_P
+from app.core.constants import DEFAULT_MODEL, DEFAULT_TEMPERATURE, DEFAULT_TOP_K, DEFAULT_TOP_P
 
 
 class ChatRequest(BaseModel):
@@ -10,7 +10,7 @@ class ChatRequest(BaseModel):
     temperature: Optional[float] = DEFAULT_TEMPERATURE
     stream: Optional[bool] = False
     tools: Optional[List[dict]] = []
-    max_tokens: Optional[int] = DEFAULT_MAX_TOKENS
+    max_tokens: Optional[int] = None
     top_p: Optional[float] = DEFAULT_TOP_P
     top_k: Optional[int] = DEFAULT_TOP_K
     stop: Optional[List[str]] = []