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）

scripts/db/schema.py

@@ -0,0 +1,113 @@
+"""高校人事请假考勤：业务表 DDL 与表名常量。"""
+
+from __future__ import annotations
+
+EMPLOYEES_TABLE = "employees"
+LEAVE_POLICIES_TABLE = "leave_policies"
+ATTENDANCE_HOLIDAYS_TABLE = "attendance_holidays"
+LEAVE_REQUESTS_TABLE = "leave_requests"
+LEAVE_BALANCES_TABLE = "leave_balances"
+
+BUSINESS_TABLES: tuple[str, ...] = (
+    EMPLOYEES_TABLE,
+    LEAVE_POLICIES_TABLE,
+    ATTENDANCE_HOLIDAYS_TABLE,
+    LEAVE_REQUESTS_TABLE,
+    LEAVE_BALANCES_TABLE,
+)
+
+EMPLOYEES_DDL = """
+CREATE TABLE IF NOT EXISTS employees (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name TEXT NOT NULL,
+    employee_no TEXT,
+    department TEXT,
+    position TEXT,
+    position_category TEXT,
+    join_date TEXT,
+    monthly_salary REAL NOT NULL DEFAULT 0,
+    annual_leave_remaining REAL NOT NULL DEFAULT 0,
+    is_active INTEGER NOT NULL DEFAULT 1,
+    notes TEXT,
+    created_at INTEGER NOT NULL DEFAULT (unixepoch()),
+    updated_at INTEGER NOT NULL DEFAULT (unixepoch())
+)
+"""
+
+LEAVE_POLICIES_DDL = """
+CREATE TABLE IF NOT EXISTS leave_policies (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    leave_type TEXT NOT NULL,
+    max_days REAL,
+    day_basis TEXT NOT NULL DEFAULT 'workday',
+    paid_days REAL NOT NULL DEFAULT 0,
+    partial_pay_ratio REAL NOT NULL DEFAULT 1.0,
+    unpaid_after_days REAL,
+    requires_certificate INTEGER NOT NULL DEFAULT 0,
+    can_offset_annual INTEGER NOT NULL DEFAULT 0,
+    approval_threshold_dept INTEGER NOT NULL DEFAULT 3,
+    approval_threshold_hr INTEGER NOT NULL DEFAULT 10,
+    notes TEXT,
+    created_at INTEGER NOT NULL DEFAULT (unixepoch()),
+    updated_at INTEGER NOT NULL DEFAULT (unixepoch())
+)
+"""
+
+ATTENDANCE_HOLIDAYS_DDL = """
+CREATE TABLE IF NOT EXISTS attendance_holidays (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    holiday_date TEXT NOT NULL,
+    holiday_name TEXT,
+    holiday_type TEXT NOT NULL DEFAULT '法定假日',
+    created_at INTEGER NOT NULL DEFAULT (unixepoch()),
+    updated_at INTEGER NOT NULL DEFAULT (unixepoch())
+)
+"""
+
+LEAVE_REQUESTS_DDL = """
+CREATE TABLE IF NOT EXISTS leave_requests (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    employee_id INTEGER NOT NULL,
+    leave_type TEXT NOT NULL,
+    start_date TEXT NOT NULL,
+    end_date TEXT NOT NULL,
+    has_certificate INTEGER NOT NULL DEFAULT 0,
+    certificate_type TEXT,
+    natural_days INTEGER,
+    working_days INTEGER,
+    monthly_salary REAL,
+    working_days_in_month INTEGER,
+    daily_salary REAL,
+    deduction_amount REAL,
+    annual_leave_used REAL,
+    remaining_annual_leave REAL,
+    approval_level TEXT,
+    status TEXT NOT NULL DEFAULT 'draft',
+    params_json TEXT,
+    summary TEXT,
+    error_message TEXT,
+    created_at INTEGER NOT NULL DEFAULT (unixepoch()),
+    updated_at INTEGER NOT NULL DEFAULT (unixepoch())
+)
+"""
+
+LEAVE_BALANCES_DDL = """
+CREATE TABLE IF NOT EXISTS leave_balances (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    employee_id INTEGER NOT NULL,
+    balance_type TEXT NOT NULL,
+    total_days REAL,
+    used_days REAL NOT NULL DEFAULT 0,
+    remaining_days REAL,
+    created_at INTEGER NOT NULL DEFAULT (unixepoch()),
+    updated_at INTEGER NOT NULL DEFAULT (unixepoch())
+)
+"""
+
+TABLE_DDL: tuple[tuple[str, str], ...] = (
+    (EMPLOYEES_TABLE, EMPLOYEES_DDL),
+    (LEAVE_POLICIES_TABLE, LEAVE_POLICIES_DDL),
+    (ATTENDANCE_HOLIDAYS_TABLE, ATTENDANCE_HOLIDAYS_DDL),
+    (LEAVE_REQUESTS_TABLE, LEAVE_REQUESTS_DDL),
+    (LEAVE_BALANCES_TABLE, LEAVE_BALANCES_DDL),
+)