add: full multi-tenancy control

packages/Webkul/Quote/src/Models/Quote.php

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+<?php
+
+namespace Webkul\Quote\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Webkul\Attribute\Traits\CustomAttribute;
+use Webkul\Contact\Models\PersonProxy;
+use Webkul\Lead\Models\LeadProxy;
+use Webkul\Quote\Contracts\Quote as QuoteContract;
+use Webkul\User\Models\UserProxy;
+
+class Quote extends Model implements QuoteContract
+{
+    use CustomAttribute;
+
+    protected $table = 'quotes';
+
+    protected $casts = [
+        'billing_address'  => 'array',
+        'shipping_address' => 'array',
+        'expired_at'       => 'datetime',
+    ];
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = [
+        'subject',
+        'description',
+        'billing_address',
+        'shipping_address',
+        'discount_percent',
+        'discount_amount',
+        'tax_amount',
+        'adjustment_amount',
+        'sub_total',
+        'grand_total',
+        'expired_at',
+        'user_id',
+        'person_id',
+    ];
+
+    /**
+     * Get the quote items record associated with the quote.
+     */
+    public function items()
+    {
+        return $this->hasMany(QuoteItemProxy::modelClass());
+    }
+
+    /**
+     * Get the user that owns the quote.
+     */
+    public function user()
+    {
+        return $this->belongsTo(UserProxy::modelClass());
+    }
+
+    /**
+     * Get the person that owns the quote.
+     */
+    public function person()
+    {
+        return $this->belongsTo(PersonProxy::modelClass());
+    }
+
+    /**
+     * The leads that belong to the quote.
+     */
+    public function leads()
+    {
+        return $this->belongsToMany(LeadProxy::modelClass(), 'lead_quotes');
+    }
+}

packages/Webkul/Quote/src/Models/QuoteItem.php

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+<?php
+
+namespace Webkul\Quote\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Webkul\Quote\Contracts\QuoteItem as QuoteItemContract;
+
+class QuoteItem extends Model implements QuoteItemContract
+{
+    protected $table = 'quote_items';
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = [
+        'sku',
+        'name',
+        'quantity',
+        'price',
+        'coupon_code',
+        'discount_percent',
+        'discount_amount',
+        'tax_percent',
+        'tax_amount',
+        'total',
+        'product_id',
+        'quote_id',
+    ];
+
+    /**
+     * Get the quote record associated with the quote item.
+     */
+    public function quote()
+    {
+        return $this->belongsTo(QuoteProxy::modelClass());
+    }
+}

packages/Webkul/Quote/src/Models/QuoteItemProxy.php

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+<?php
+
+namespace Webkul\Quote\Models;
+
+use Konekt\Concord\Proxies\ModelProxy;
+
+class QuoteItemProxy extends ModelProxy {}

packages/Webkul/Quote/src/Models/QuoteProxy.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Webkul\Quote\Models;
+
+use Konekt\Concord\Proxies\ModelProxy;
+
+class QuoteProxy extends ModelProxy {}