fix: 年份动态计算 + 首页布局优化

- 后端所有硬编码2026替换为date.today().year动态计算
- 首页移除4个快捷跳转卡片
- 首页新增时间段筛选下拉框
- 版本号更新至v1.0.0.3

backend/helpers.py

@@ -2,6 +2,7 @@
 # 依赖：db.py；被 routes.py 和 migrations/seed_data.py 调用
 
 import json
+from datetime import date
 from pathlib import Path
 from db import _exec, rows, one
 
@@ -61,7 +62,8 @@ def attach_common(conn, resource, items):
 
 
 def monthly_finance(conn, tenant="科普·无界"):
-    months = [f"2026-{m:02d}" for m in range(1, 13)]
+    _year = date.today().year
+    months = [f"{_year}-{m:02d}" for m in range(1, 13)]
     pfs = rows(conn,
         "SELECT sign_amount, sign_month, status, budget_data, expense_data FROM project_finances WHERE tenant=? AND status='已签约'",
         [tenant])