[ADD] product_kit: add kit product management with sale order integration and configuration wizard

[vivah-odoo]

Purpose

This module allows users to define products as kits composed of multiple
component products. When added to a sale order, kits can be configured
via a wizard (quantities/prices per component) and automatically explode
into component lines upon order confirmation.

Task

Create a product_kit module under tutorials/ with the following structure:

• product_template: is_kit boolean + kit_product_ids (One2many to components)
• sale_order: kit_lines_count, action_confirm override for kit explosion
• sale_order_line: kit_line_ids/parent_kit_line_id with unlink cascade
• kit.config.wizard: TransientModel for interactive component configuration
• Views: product form (is_kit toggle + Kit Components page), sale order
  form (Configure Kit gear icon on lines), wizard form
• Security: model access rights

What Was Done

• Defined product.kit.line model for storing kit component products
• Extended sale.order.line with self-referential kit relationships
• Extended sale.order to auto-explode kits on confirmation
• Built a wizard for adjusting component quantities/prices before confirm
• All views updated with Odoo 19 compatible syntax

How It Works

1. Products → mark product as kit, define components with quantities
2. Sale Order → add kit product, click gear icon to configure components
3. Wizard → adjust component qty/price, confirm → parent becomes section
4. Confirm order → component lines generate stock moves, kit line zeroed

Dependencies

• base, sale, product, stock

Compatibility

• Odoo 19 (uses tag, direct invisible attribute)

[robodoo]