feat(tasks): 任务列表新增漏洞数量列，描述/目标列收窄

- 任务列表接口 TaskListMetricsAll 批量统计每任务的漏洞数(findings 表，
  按 task_id)，经 TaskDTO.findings 下发；列表页新增「漏洞」列，>0 高亮
- 描述/目标列宽 max-w-xs → max-w-40，目标列补 title 悬浮全文
- mock data/handler 同步补 findings 字段

web/src/lib/mock/data.ts

@@ -65,6 +65,7 @@ export const tasks: Task[] = [
     paused: false,
     active: true,
     in_flight: 3,
+    findings: 4,
     stalled: false,
     goals_total: 5,
     goals_met: 2,
@@ -90,6 +91,7 @@ export const tasks: Task[] = [
     paused: false,
     active: false,
     in_flight: 2,
+    findings: 2,
     stalled: false,
     goals_total: 4,
     goals_met: 1,

web/src/lib/mock/handler.ts

@@ -1192,6 +1192,7 @@ function route(m: string, path: string, seg: string[], q: URLSearchParams, b: Re
       paused: false,
       active: true,
       in_flight: 0,
+      findings: 0,
       stalled: false,
       goals_total: 0,
       goals_met: 0,

web/src/lib/types.ts

@@ -23,6 +23,7 @@ export interface Task {
   queued?: boolean;
   active?: boolean;
   in_flight?: number;
+  findings?: number; // 该任务已登记的漏洞数
   last_activity?: string;
   stalled?: boolean;
   goals_total?: number;