feat: 支持 Gemini 格式请求，并优化日志和配置

app/schemas/openai_models.py

@@ -0,0 +1,17 @@
+from pydantic import BaseModel
+from typing import List, Optional, Union
+
+
+class ChatRequest(BaseModel):
+    messages: List[dict]
+    model: str = "gemini-1.5-flash-002"
+    temperature: Optional[float] = 0.7
+    stream: Optional[bool] = False
+    tools: Optional[List[dict]] = []
+    tool_choice: Optional[str] = "auto"
+
+
+class EmbeddingRequest(BaseModel):
+    input: Union[str, List[str]]
+    model: str = "text-embedding-004"
+    encoding_format: Optional[str] = "float"