feat: 第五阶段办公协同/统计报表/知识库模块

- 新增3个migration(9张表): office(6表)/report(1表)/kb(2表)
- 新增9个Model + 9个Controller
- 新增43条API路由(总计305条)
- 新增3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/Office/Announcement.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Models\Office;
+
+use App\Models\User;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Announcement extends Model
+{
+    use BelongsToStore;
+
+    protected $fillable = [
+        'store_id', 'title', 'content', 'type', 'is_top',
+        'publish_status', 'published_at', 'author_id',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'type' => 'integer',
+            'publish_status' => 'integer',
+            'is_top' => 'boolean',
+            'published_at' => 'datetime',
+        ];
+    }
+
+    public function author(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'author_id');
+    }
+}

backend/app/Models/Office/Approval.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace App\Models\Office;
+
+use App\Models\User;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Approval extends Model
+{
+    use BelongsToStore;
+
+    protected $fillable = [
+        'store_id', 'template_id', 'title', 'applicant_id', 'form_data',
+        'status', 'current_node', 'related_type', 'related_id',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'status' => 'integer',
+            'current_node' => 'integer',
+            'form_data' => 'array',
+        ];
+    }
+
+    public function template(): BelongsTo
+    {
+        return $this->belongsTo(ApprovalTemplate::class, 'template_id');
+    }
+
+    public function applicant(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'applicant_id');
+    }
+
+    public function nodes(): HasMany
+    {
+        return $this->hasMany(ApprovalNode::class);
+    }
+}

backend/app/Models/Office/ApprovalNode.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Models\Office;
+
+use App\Models\User;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class ApprovalNode extends Model
+{
+    const UPDATED_AT = null;
+
+    protected $fillable = [
+        'approval_id', 'node_order', 'approver_id', 'action', 'comment', 'acted_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'node_order' => 'integer',
+            'action' => 'integer',
+            'acted_at' => 'datetime',
+        ];
+    }
+
+    public function approval(): BelongsTo
+    {
+        return $this->belongsTo(Approval::class);
+    }
+
+    public function approver(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'approver_id');
+    }
+}

backend/app/Models/Office/ApprovalTemplate.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Models\Office;
+
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+
+class ApprovalTemplate extends Model
+{
+    use BelongsToStore;
+
+    protected $fillable = [
+        'store_id', 'name', 'type', 'form_fields', 'flow_nodes', 'status', 'sort',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'type' => 'integer',
+            'status' => 'integer',
+            'sort' => 'integer',
+            'form_fields' => 'array',
+            'flow_nodes' => 'array',
+        ];
+    }
+}

backend/app/Models/Office/Handover.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Models\Office;
+
+use App\Models\User;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Handover extends Model
+{
+    use BelongsToStore;
+
+    const UPDATED_AT = null;
+
+    protected $fillable = [
+        'store_id', 'shift_date', 'shift_type', 'handover_user_id',
+        'receiver_user_id', 'content', 'issues', 'status', 'confirmed_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'shift_type' => 'integer',
+            'status' => 'integer',
+            'shift_date' => 'date',
+            'confirmed_at' => 'datetime',
+        ];
+    }
+
+    public function handoverUser(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'handover_user_id');
+    }
+
+    public function receiverUser(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'receiver_user_id');
+    }
+}

backend/app/Models/Office/Notification.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Models\Office;
+
+use App\Models\User;
+use App\Traits\BelongsToStore;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Notification extends Model
+{
+    use BelongsToStore;
+
+    const UPDATED_AT = null;
+
+    protected $table = 'notifications';
+
+    protected $fillable = [
+        'store_id', 'user_id', 'title', 'content', 'type',
+        'related_type', 'related_id', 'is_read', 'read_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'type' => 'integer',
+            'is_read' => 'boolean',
+            'read_at' => 'datetime',
+        ];
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+}