feat: 第四阶段财务与人事薪资模块

- 新增2个migration(11张表): finance(6表)/hr(5表)
- 新增11个Model + 11个Controller
- 新增50条API路由(总计262条)
- 新增2个前端API模块 + 10个管理页面
- 迁移运行通过, vite build验证通过

backend/app/Models/Hr/SalaryRecord.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Models\Hr;
+
+use App\Models\User;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class SalaryRecord extends Model
+{
+    use BelongsToStore;
+
+    protected $fillable = [
+        'store_id', 'user_id', 'year_month',
+        'base_salary', 'position_salary', 'performance', 'overtime_pay',
+        'subsidy', 'social_insurance', 'housing_fund', 'tax',
+        'absence_deduction', 'other_deduction', 'actual_amount',
+        'status', 'confirmed_at', 'paid_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'base_salary' => 'decimal:2',
+            'position_salary' => 'decimal:2',
+            'performance' => 'decimal:2',
+            'overtime_pay' => 'decimal:2',
+            'subsidy' => 'decimal:2',
+            'social_insurance' => 'decimal:2',
+            'housing_fund' => 'decimal:2',
+            'tax' => 'decimal:2',
+            'absence_deduction' => 'decimal:2',
+            'other_deduction' => 'decimal:2',
+            'actual_amount' => 'decimal:2',
+            'status' => 'integer',
+            'confirmed_at' => 'datetime',
+            'paid_at' => 'datetime',
+        ];
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+}