feat: 第三阶段业务模块(服务产康/月嫂/进销存)

- 新增3个migration(15张表): service/nanny/inventory
- 新增15个Model + 13个Controller
- 新增55条API路由(总计212条)
- 新增3个前端API模块 + 11个管理页面
- vite build验证通过

backend/app/Models/Inventory/Inventory.php

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+<?php
+namespace App\Models\Inventory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+class Inventory extends Model
+{
+    const CREATED_AT = null;
+    protected $table = 'inventories';
+    protected $fillable = ['warehouse_id','material_id','quantity','batch_no','expire_date'];
+    protected function casts(): array { return ['quantity'=>'decimal:2','expire_date'=>'date']; }
+    public function warehouse(): BelongsTo { return $this->belongsTo(Warehouse::class); }
+    public function material(): BelongsTo { return $this->belongsTo(Material::class); }
+}

backend/app/Models/Inventory/Material.php

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+<?php
+namespace App\Models\Inventory;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+class Material extends Model
+{
+    use BelongsToStore;
+    protected $fillable = ['store_id','name','code','category','unit','spec','min_stock','shelf_life_days','status'];
+    protected function casts(): array { return ['min_stock'=>'integer','shelf_life_days'=>'integer','status'=>'integer']; }
+}

backend/app/Models/Inventory/PurchaseOrder.php

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+<?php
+namespace App\Models\Inventory;
+use App\Models\User;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+class PurchaseOrder extends Model
+{
+    use BelongsToStore;
+    protected $fillable = ['store_id','order_no','supplier_id','total_amount','status','items','audit_user_id','audit_at','remark','created_by'];
+    protected function casts(): array { return ['total_amount'=>'decimal:2','status'=>'integer','items'=>'array','audit_at'=>'datetime']; }
+    public function supplier(): BelongsTo { return $this->belongsTo(Supplier::class); }
+    public function auditor(): BelongsTo { return $this->belongsTo(User::class, 'audit_user_id'); }
+    public function creator(): BelongsTo { return $this->belongsTo(User::class, 'created_by'); }
+}

backend/app/Models/Inventory/StockMovement.php

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+<?php
+namespace App\Models\Inventory;
+use App\Models\User;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+class StockMovement extends Model
+{
+    use BelongsToStore;
+    protected $fillable = ['store_id','warehouse_id','movement_no','type','direction','items','related_order','status','operator_id','remark'];
+    protected function casts(): array { return ['type'=>'integer','direction'=>'integer','items'=>'array','status'=>'integer']; }
+    public function warehouse(): BelongsTo { return $this->belongsTo(Warehouse::class); }
+    public function operator(): BelongsTo { return $this->belongsTo(User::class, 'operator_id'); }
+}

backend/app/Models/Inventory/Supplier.php

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+<?php
+namespace App\Models\Inventory;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+class Supplier extends Model
+{
+    use BelongsToStore;
+    protected $fillable = ['store_id','name','contact','phone','address','bank_info','status'];
+    protected function casts(): array { return ['status'=>'integer']; }
+}

backend/app/Models/Inventory/Warehouse.php

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+<?php
+namespace App\Models\Inventory;
+use App\Models\User;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+class Warehouse extends Model
+{
+    use BelongsToStore;
+    protected $fillable = ['store_id','name','manager_id','status'];
+    protected function casts(): array { return ['status'=>'integer']; }
+    public function manager(): BelongsTo { return $this->belongsTo(User::class, 'manager_id'); }
+}