**Steps to reproduce:**
* Install the **l10n_pe_edi** module.
* Change the company currency to **USD**.
* Configure **Peruvian detraction** settings:
  * Set a **withholding percentage** on a product.
  * Set a **withholding code** on the same product.
* Create a customer invoice in **USD**.
* Set the **Operation Type** to **[1001] Operation Subject to Detraction**.
* Add the configured product to the invoice.
* Confirm the invoice, **send it to SUNAT** by *process now**, and generate the ZIP which has XML.

**Observed behavior:**
* The generated XML contains: `<cbc:Amount currencyID="PEN">116.82</cbc:Amount>` The `currencyID` is `PEN` but the amount is the raw USD value instead of being converted to PEN using the exchange rate.
* The PDF report also shows the withholding amount with the wrong currency symbol.

**Cause:**
* `_l10n_pe_edi_get_spot()` computed `spot['amount']` as `amount_total_signed * percent`, where `amount_total_signed` is stored in the **company currency**. When the company currency is PEN this works correctly, but when it is changed to USD the value is in USD while the XML node hardcodes `currencyID="PEN"`.
* `spot['currency']` was also set to `company_id.currency_id`, so the PDF rendered the amount with the wrong currency symbol.
* In `_add_invoice_payment_terms_nodes`, `spot_amount` was selected via `spot['amount'] if invoice.currency_id == invoice.company_id.currency_id` which relied on company currency being PEN as a proxy for the invoice being in PEN, breaking when company currency is USD.

**Fix:**
* In `_l10n_pe_edi_get_spot()`, compute `spot['amount']` by explicitly converting `amount_total` from the invoice currency to PEN using `currency_id._convert(..., env.ref('base.PEN'), ...)`, ensuring the detraction amount is always in PEN regardless of the company currency.
* Set `spot['currency']` to `env.ref('base.PEN')` so the PDF report always displays the withholding amount with the correct PEN symbol.
* In `_add_invoice_payment_terms_nodes`, always use `spot['spot_amount']` (invoice currency amount) for the `FormaPago`/`Cuota` arithmetic, since `spot['amount']` is now exclusively the PEN amount for the detraction XML node.

opw-6327571

Forward-Port-Of: odoo/enterprise#123782

**Issue:**

Envia API documentation is very bad. When trying to generate an Amazon Ground shipping with Envia, the API will sometimes reject the payload with the following error:

`Total items weight exceeds package weight. Please refer to API documentation for allowable limits. (D-703)`

Even though the [Envia documentation](https://docs.envia.com/reference/create-shipping-label) doesn't include it, it seems that Amazon requires the weight for each product. If the payload doesn't include the per-item weight, Amazon will set a default weight, which will cause the error to show up if the delivery contains a high quantity. This can be a blocking issue for some customers.

**Steps to reproduce on a fresh DB:**

- Install Inventory, Sales, and Envia Shipping
- Switch company to be based in India (need to provide an address to deliver from, I just used the Odoo India address - InfoCity Gate, Gandhinagar, Gujarat 382007)
- Configure an Amazon delivery carrier with Envia (India seems to be the only country that supports Amazon with Envia)
	- Inventory > Configuration > Delivery Methods > Envia.com method
	- Must be in a Production environment (because Envia's sandbox server does not work for some reason?)
	- Add an Envia Production Access Token (will have to use one with some funds)
	- Change 'Ship From' to India
	- Configure the `Envia.com Service Name`, set Carrier and Service to AMAZON and AMAZON - Amazon Shipping Standard
- Create a demo product, give it an arbitrary weight like 0.1 kg
- Create a sales order to an Indian customer, include the demo product with a high quantity (like 20), confirm (might have to create a warehouse and configure the customer's information)
- On the generated picking, set the Carrier to Envia.com on the Additional Info tab
- When trying to Validate, it should throw the error

**Fix:**
When generating the payload in _get_shipping_lines() in envia_request, include the item weight in the dictionary.

Related ticket: opw-6261682

Forward-Port-Of: odoo/enterprise#123935

Marketplace orders with discount lines could not match the
platform total: Odoo accumulated a small rounding residue vs Shopee's
total_amount / Lazada's order price.

sale_shopee
-----------
Changes:
- Fetch buyer-side escrow amounts via `_fetch_order_income` and pass them
  through `self.env.context` (`order_income`).
- Build item lines from the buyer-paid item price with `discount=0` and a
  recomputed tax-exclusive `price_unit`.
- Distribute order-level discounts (seller/platform vouchers and coins) as
  dedicated negative lines per product tax group via
  `_prepare_discount_lines_values`.
- Append a shipping line from `buyer_paid_shipping_fee` with fiscal-position
  mapped taxes.
- Reconcile any leftover residue with `_adjust_order_total` using a single
  tax-free amount-adjustment line.
- Register `default_discount_product` and configure it on upgrade (v1.1).


sale_lazada
-----------
- Port the same reconciliation model as shopee: reconciled line specs, discount=0 with
  discounted unit from paid_price, shipping line from shipping_fee, order-level
  "Discount line" distributed at order-level.

task-6112062

Forward-Port-Of: odoo/enterprise#117561