feat(工作台): 细化计划进展工时证据

关键改动：

- 支持需求覆盖和调研方向开始工作记录

- 日报按计划记录开始时间和进度下次开始时间计算证据

- 更新版本编辑校验、项目展示和 workflow 说明

Co-Authored-By: Codex GPT-5 <codex@openai.com>

apps/web/lib/work-activity-research-direction.test.ts

@@ -35,6 +35,7 @@ test('makeVersionPlanResearchDirectionProgressActivity records direction progres
     coverageStatus: 'partial',
     completedContent: '完成登录流程对比',
     remainingContent: '补充支付流程差异',
+    workStartedAt: '2026-06-30T09:30:00.000Z',
   });
 
   assert.equal(activity?.action, 'version_plan_research_direction_progress');
@@ -46,4 +47,5 @@ test('makeVersionPlanResearchDirectionProgressActivity records direction progres
   assert.equal(activity?.metadata?.directionTaskId, 'task-1');
   assert.equal(activity?.metadata?.completedContent, '完成登录流程对比');
   assert.equal(activity?.metadata?.remainingContent, '补充支付流程差异');
+  assert.equal(activity?.metadata?.workStartedAt, '2026-06-30T09:30:00.000Z');
 });