feat: 初始化高校人事请假考勤技能 (process-leave-attendance-default)

基于 skill-template 脚手架开发，包含：
- 5 张业务表（教职工、请假政策、考勤日历、请假记录、假期余额）
- 请假核算引擎（扣薪计算、审批层级判定、年假抵扣）
- CLI 入口（import-employees / calculate-leave / render-html）
- HTML 审批与扣薪报告生成
- 示例数据与完整测试套件（295 tests passed）

assets/samples/示例政策.json

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+{
+  "policies": [
+    {
+      "leave_type": "病假",
+      "max_days": 180,
+      "day_basis": "workday",
+      "paid_days": 30,
+      "partial_pay_ratio": 0.7,
+      "unpaid_after_days": 60,
+      "requires_certificate": 1,
+      "can_offset_annual": 0,
+      "approval_threshold_dept": 3,
+      "approval_threshold_hr": 10,
+      "notes": "30天全薪；31-60天按70%支付；>60天按当地最低工资"
+    },
+    {
+      "leave_type": "事假",
+      "max_days": 90,
+      "day_basis": "workday",
+      "paid_days": 0,
+      "partial_pay_ratio": 0,
+      "unpaid_after_days": 0,
+      "requires_certificate": 0,
+      "can_offset_annual": 1,
+      "approval_threshold_dept": 3,
+      "approval_threshold_hr": 10,
+      "notes": "全额扣薪，可用年假抵扣"
+    },
+    {
+      "leave_type": "婚假",
+      "max_days": 15,
+      "day_basis": "natural",
+      "paid_days": 15,
+      "partial_pay_ratio": 0,
+      "unpaid_after_days": 15,
+      "requires_certificate": 1,
+      "can_offset_annual": 0,
+      "approval_threshold_dept": 3,
+      "approval_threshold_hr": 10,
+      "notes": "国家3天+地方奖励；超期按事假"
+    },
+    {
+      "leave_type": "丧假",
+      "max_days": 3,
+      "day_basis": "natural",
+      "paid_days": 3,
+      "partial_pay_ratio": 0,
+      "unpaid_after_days": 3,
+      "requires_certificate": 1,
+      "can_offset_annual": 0,
+      "approval_threshold_dept": 3,
+      "approval_threshold_hr": 3,
+      "notes": "直系亲属1-3天带薪"
+    },
+    {
+      "leave_type": "产假",
+      "max_days": 158,
+      "day_basis": "natural",
+      "paid_days": 158,
+      "partial_pay_ratio": 0,
+      "unpaid_after_days": 158,
+      "requires_certificate": 1,
+      "can_offset_annual": 0,
+      "approval_threshold_dept": 0,
+      "approval_threshold_hr": 0,
+      "notes": "98天国家+地方奖励；需校领导审批"
+    },
+    {
+      "leave_type": "育假",
+      "max_days": 365,
+      "day_basis": "natural",
+      "paid_days": 30,
+      "partial_pay_ratio": 0.7,
+      "unpaid_after_days": 365,
+      "requires_certificate": 1,
+      "can_offset_annual": 0,
+      "approval_threshold_dept": 0,
+      "approval_threshold_hr": 0,
+      "notes": "可延至子女满周岁；需校领导审批"
+    },
+    {
+      "leave_type": "长期病假",
+      "max_days": 365,
+      "day_basis": "workday",
+      "paid_days": 30,
+      "partial_pay_ratio": 0.7,
+      "unpaid_after_days": 60,
+      "requires_certificate": 1,
+      "can_offset_annual": 0,
+      "approval_threshold_dept": 10,
+      "approval_threshold_hr": 10,
+      "notes": "30天全薪；31-60天70%；>60天按当地最低工资"
+    }
+  ],
+  "holidays": [
+    { "holiday_date": "2026-09-12", "holiday_name": "周末", "holiday_type": "周末" },
+    { "holiday_date": "2026-09-13", "holiday_name": "周末", "holiday_type": "周末" },
+    { "holiday_date": "2026-09-19", "holiday_name": "周末", "holiday_type": "周末" },
+    { "holiday_date": "2026-09-20", "holiday_name": "周末", "holiday_type": "周末" },
+    { "holiday_date": "2026-09-26", "holiday_name": "周末", "holiday_type": "周末" },
+    { "holiday_date": "2026-09-27", "holiday_name": "周末", "holiday_type": "周末" },
+    { "holiday_date": "2026-10-01", "holiday_name": "国庆节", "holiday_type": "法定假日" },
+    { "holiday_date": "2026-10-02", "holiday_name": "国庆节", "holiday_type": "法定假日" },
+    { "holiday_date": "2026-10-03", "holiday_name": "国庆节", "holiday_type": "法定假日" }
+  ]
+}

assets/samples/示例教职工.json

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+{
+  "employees": [
+    {
+      "name": "张教授",
+      "employee_no": "T2015091",
+      "department": "数学学院",
+      "position": "副教授",
+      "position_category": "教师",
+      "join_date": "2015-09-01",
+      "monthly_salary": 12000,
+      "annual_leave_remaining": 5,
+      "is_active": 1,
+      "notes": "示例：病假核算（30天内全薪）"
+    },
+    {
+      "name": "李老师",
+      "employee_no": "T2018102",
+      "department": "物理学院",
+      "position": "讲师",
+      "position_category": "教师",
+      "join_date": "2018-09-01",
+      "monthly_salary": 9000,
+      "annual_leave_remaining": 7,
+      "is_active": 1
+    },
+    {
+      "name": "王主任",
+      "employee_no": "A2012033",
+      "department": "人事处",
+      "position": "科长",
+      "position_category": "行政",
+      "join_date": "2012-07-01",
+      "monthly_salary": 10000,
+      "annual_leave_remaining": 10,
+      "is_active": 1
+    },
+    {
+      "name": "赵研究员",
+      "employee_no": "R2019044",
+      "department": "材料所",
+      "position": "副研究员",
+      "position_category": "科研",
+      "join_date": "2019-03-01",
+      "monthly_salary": 11000,
+      "annual_leave_remaining": 6,
+      "is_active": 1
+    }
+  ]
+}