feat: 新增模型管理和供应商配置功能

### v1.1.0
- #### Added
  - 新增 AI 笔记风格选择
  - 新增 AI 笔记返回格式选择
  - 添加 AI 自定义笔记备注 Prompt
  - 添加任务失败重试
  - 添加全局设置页，可在设置页进行模型设置

- #### Optimize
  - 优化前端样式，优化用户体验
  - 增加生成中间产物，可用于失败后加快生成速度
- #### Fix
  - 修复视频截图视频过早删除错误

backend/app/db/model_dao.py

@@ -0,0 +1,58 @@
+from app.db.sqlite_client import get_connection
+
+def init_model_table():
+    conn = get_connection()
+    cursor = conn.cursor()
+    cursor.execute("""
+        CREATE TABLE IF NOT EXISTS models (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            provider_id INTEGER NOT NULL,
+            model_name TEXT NOT NULL,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+        )
+    """)
+    conn.commit()
+    conn.close()
+
+# 插入模型
+def insert_model(provider_id: int, model_name: str):
+    conn = get_connection()
+    cursor = conn.cursor()
+    cursor.execute("""
+        INSERT INTO models (provider_id, model_name)
+        VALUES (?, ?)
+    """, (provider_id, model_name))
+    conn.commit()
+    conn.close()
+
+# 根据provider查模型
+def get_models_by_provider(provider_id: int):
+    conn = get_connection()
+    cursor = conn.cursor()
+    cursor.execute("""
+        SELECT id, model_name FROM models
+        WHERE provider_id = ?
+    """, (provider_id,))
+    rows = cursor.fetchall()
+    conn.close()
+    return [{"id": row[0], "model_name": row[1]} for row in rows]
+
+# 删除某个模型
+def delete_model(model_id: int):
+    conn = get_connection()
+    cursor = conn.cursor()
+    cursor.execute("""
+        DELETE FROM models WHERE id = ?
+    """, (model_id,))
+    conn.commit()
+    conn.close()
+
+def get_all_models():
+    conn = get_connection()
+    cursor = conn.cursor()
+    cursor.execute("""
+        SELECT id, provider_id, model_name FROM models
+    """)
+    rows = cursor.fetchall()
+    conn.close()
+    return [{"id": row[0], "provider_id": row[1], "model_name": row[2]} for row in rows]