[ADD] zero_stock_blockage: approval checkbox for sale order confirmation

- Added `is_approval` boolean field to `sale.order` model.
- Introduced computed field `is_approval_read` to control read-only access.
- Only Sales Managers (based on group) can edit the approval checkbox.
- Overrode `action_confirm` to block confirmation if not approved.
- XML view updated to display approval checkbox next to payment terms.
- Enforces a lightweight approval mechanism before confirming sales orders.

Author: kuay-odoo

zero_stock_blockage/__init__.py

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+from . import models

zero_stock_blockage/__manifest__.py

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+{
+    "name": "Zero Stock Blockage",
+    "description": "Apply approval to confirm sale order",
+    "version": "1.0",
+    "depends": ["sale_management"],
+    "data": [
+       "views/sale_order.xml",
+    ],
+    "auto-install": True,
+    "application": False,
+    "license": "LGPL-3",
+}

zero_stock_blockage/models/__init__.py

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+from . import sale_order

zero_stock_blockage/models/sale_order.py

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+from odoo import api, fields, models
+from odoo.exceptions import UserError
+
+
+class SaleOrder(models.Model):
+    _inherit = "sale.order"
+
+    is_approval = fields.Boolean(string="Approval")
+    is_approval_read = fields.Boolean(compute="_compute_to_set_approval")
+
+    @api.depends_context("uid")
+    def _compute_to_set_approval(self):
+        user = self.env.user
+        is_user_manager = user.has_group("sales_team.group_sale_manager")
+        for record in self:
+            if is_user_manager:
+                record.is_approval_read = True
+            else:
+                record.is_approval_read = False
+
+    def action_confirm(self):
+        if not self.is_approval:
+            raise UserError("You are not authenticated to Confirm Sale Order")
+
+        return super().action_confirm()

zero_stock_blockage/views/sale_order.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="sale_approval_checkbox" model="ir.ui.view">
+        <field name="name">sale.approval.checkbox</field>
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale.view_order_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='payment_term_id']" position="after">
+                <field name="is_approval" readonly="not is_approval_read" />
+            </xpath>
+        </field>
+    </record>
+</odoo>