新增仪表盘和统计分析数据API，优化外链过期时间处理，完善日志记录功能，更新前端样式以提升用户体验，确保数据统计准确性和可视化展示。

utils/detebase.py

@@ -320,6 +320,79 @@ class CloudDriveDatabase:
         except Exception:
             return False
     
+    # 新增统计方法
+    def get_total_user_drives_count(self) -> int:
+        """获取用户网盘总数"""
+        try:
+            self.cursor.execute("SELECT COUNT(*) FROM user_drives")
+            result = self.cursor.fetchone()
+            return result[0] if result else 0
+        except Exception as e:
+            print(f"获取用户网盘总数错误: {e}")
+            return 0
+
+    def get_active_external_links_count(self) -> int:
+        """获取活跃外链数量 (未过期且有剩余次数)"""
+        try:
+            from datetime import datetime, timezone
+            now_utc_iso = datetime.now(timezone.utc).isoformat()
+            
+            # 注意：SQLite 不直接支持 ISO 8601 比较，此查询可能需要调整或在 Python 中过滤
+            # 简单起见，我们先只检查次数和时间是否存在
+            # 更精确的查询可能需要 DATETIME 函数，或在 Python 中处理
+            self.cursor.execute(
+                """
+                SELECT COUNT(*) FROM external_links 
+                WHERE (used_quota < total_quota) 
+                  AND (expiry_time IS NOT NULL AND expiry_time > ?)
+                """, 
+                (now_utc_iso,) # 这个比较可能不适用于所有 SQLite 版本/配置，后续可能需要调整
+            )
+            # 备选（更兼容但效率低）：获取所有链接在 Python 中过滤
+            # self.cursor.execute("SELECT link_uuid, expiry_time, used_quota, total_quota FROM external_links")
+            # links = self.cursor.fetchall()
+            # count = 0
+            # for link in links:
+            #     is_active = False
+            #     if link['used_quota'] < link['total_quota']:
+            #         if link['expiry_time']:
+            #             try:
+            #                 expiry_dt = datetime.fromisoformat(link['expiry_time'].replace('Z', '+00:00'))
+            #                 if datetime.now(timezone.utc) < expiry_dt:
+            #                     is_active = True
+            #             except: pass # Ignore parsing errors
+            #         else: # No expiry time means active if quota is available
+            #             is_active = True 
+            #     if is_active:
+            #         count += 1
+            # return count
+
+            result = self.cursor.fetchone()
+            return result[0] if result else 0
+        except Exception as e:
+            print(f"获取活跃外链数量错误: {e}")
+            return 0 # 返回 0 或其他错误指示
+
+    def get_total_external_links_count(self) -> int:
+        """获取外链总数"""
+        try:
+            self.cursor.execute("SELECT COUNT(*) FROM external_links")
+            result = self.cursor.fetchone()
+            return result[0] if result else 0
+        except Exception as e:
+            print(f"获取外链总数错误: {e}")
+            return 0
+
+    def get_user_drives_count_by_provider(self) -> Dict[str, int]:
+        """按提供商统计用户网盘数量"""
+        try:
+            self.cursor.execute("SELECT provider_name, COUNT(*) as count FROM user_drives GROUP BY provider_name")
+            results = self.cursor.fetchall()
+            return {row['provider_name']: row['count'] for row in results}
+        except Exception as e:
+            print(f"按提供商统计用户网盘数量错误: {e}")
+            return {}
+            
     def close(self):
         """关闭数据库连接"""
         if self.conn: