feat(frontend): 添加数据集页面并重构主页面布局

- 新增 dataset_page 模块，实现数据集页面的基本布局
- 重构 main.py 中的页面加载方式，使用列表收集所有页面
- 更新主页面布局，将聊天页面作为第一个选项卡
- 调整设置页面的加载方式，直接使用函数调用

frontend/__init__.py

@@ -1,3 +1,4 @@
 from .chat_page import chat_page
 from .setting_page import setting_page
 from .train_page import train_page
+from .dataset_page import dataset_page

frontend/dataset_page.py

@@ -0,0 +1,9 @@
+import gradio as gr
+
+def dataset_page():
+    with gr.Blocks() as demo:
+        gr.Markdown("## 数据集")
+        with gr.Row():
+            with gr.Column():
+                pass
+    return demo

main.py

@@ -1,23 +1,27 @@
 import gradio as gr
 from frontend.setting_page import setting_page
-from frontend import chat_page,setting_page,train_page
+from frontend import chat_page,setting_page,train_page,dataset_page
 from db import initialize_db as init_db,get_engine
 
 if __name__ == "__main__":
     init_db(get_engine("workdir"))
 
-    setting_demo = setting_page()
-    chat_demo = chat_page()
-    train_demo = train_page()
+    pages = []
+    pages.append(setting_page())
+    pages.append(chat_page())
+    pages.append(train_page())
+    pages.append(dataset_page())
 
     with gr.Blocks() as app:
         gr.Markdown("# 基于文档驱动的自适应编码大模型微调框架")
         with gr.Tabs():
-            with gr.TabItem("微调"):
-                train_demo.render()
             with gr.TabItem("聊天"):
-                chat_demo.render()
+                chat_page()
+            with gr.TabItem("微调"):
+                train_page()
+            with gr.TabItem("数据集"):
+                dataset_page()
             with gr.TabItem("设置"):
-                setting_demo.render()
+                setting_page()
     
     app.launch()