Steps to reproduce:
===================
1. Go to the payment providers and set "Pay on Site" to disabled.
2. Go to Apps, clear the filter, look up "website_sale_collect" and upgrade it. This also happens on its own, as upgrading any custom module that depends on it upgrades it too.
3. Go back to the payment providers.

=> "Pay on Site" is enabled again, and published as well from 19.0 on. Customers are offered it at checkout and place orders that are never paid, without the merchant ever enabling anything.

Root cause:
===========
`data/payment_provider_data.xml` is loaded in update mode because it carries no `noupdate`, and it hardcodes the state of the provider:

    <field name="state">enabled</field>

So every upgrade of the module writes that value back over whatever the merchant configured. Every other provider ships its data with `noupdate="1"` and leaves the state alone, this module is the exception.

The file has been loaded this way since the module was added:

- [1] created the module with an updatable provider record.

Fix:
====
Load the file with `noupdate="1"`. The record is still created, enabled, when the module is installed, it is simply not written again on later upgrades. The flag is read from the file rather than from the `ir.model.data` row, so databases where the provider already exists are covered on their next upgrade, no data migration needed.

[1]: 087c48c4ed2e
opw-6528110

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Steps to reproduce:
===================
1. Create a storable product with two variants and untick "Continue selling when out-of-stock".
2. Leave the first variant at 0 in stock, put some stock on the second one.
3. try the "Add to Cart" option of the shop page.

=> The product has no add to cart button, as if it were sold out, while its second variant can be bought. Reordering the variants so that the one in stock comes first brings the button back.

Root cause:
===========
`product.template._is_sold_out()` delegates to `product_variant_id`, which is `product_variant_ids[:1]`, so a whole template is declared sold out on the sole basis of its first variant. `_website_show_quick_add()` then hides the button for the template, whatever the stock of the other variants.

The helper has looked at that single variant since it was written:

- [1] added it to hide the button of sold out products.

Fix:
====
Consider the template sold out only when all of its variants are. The check stops at the first variant in stock, so a product that can be bought still costs a single stock lookup.

[1]: https://github.com/odoo/odoo/commit/4ae197cc770cec2058e1f113209c4f93a4a0f4b2
opw-6520052

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Steps to reproduce
---
1. Set the warehouse to deliver in 3 steps.
2. Create a delivery pick not tied to a procurement group (not from a sale order) with a consumable product, and validate it.
3. On the pack transfer, put the goods in a package and validate.
4. Duplicate the pick, validate it, put its goods in a second package on the pack transfer, and validate.
5. Open the final delivery: both lines sit in the same package instead of one line per package.

Issue
---
The two picks share no procurement group, so their delivery moves merge onto a single move keyed by partner. Validating the second pack tops up that already partially reserved move: for a consumable, `_action_assign` builds its lines from `_get_available_move_lines`, which reports the availability of every upstream package without discounting what the move already reserved.

https://github.com/odoo/odoo/blob/05af9e6877fd0f044bb46c983fe7300eb1db9307/addons/stock/models/stock_move.py#L1907-L1909

The package already reserved on the first line is therefore offered again and reused, collapsing both lines onto one package. The reserved-product branch below already subtracts the move's own reservation before allocating; doing the same here leaves each package on its own line.

opw-6498532
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### Description of the issue/feature this PR addresses:
This PR fixes a server crash in the Peruvian localization (l10n_pe_reports_lib) that occurs when generating the "Inventory and Balance" General Ledger report. The crash is triggered by strict validation rules within Python's csv module, which rejects the custom line terminator used to fulfill the SUNAT PLE formatting requirements.

### Current behavior before PR:
When a user attempts to generate and export the "Inventory and Balance" report, the server crashes with a ValueError: bad delimiter or lineterminator value. This happens because the csv.DictWriter is initialized with lineterminator='|\n' to ensure every row ends with a pipe. Python's underlying csv implementation rejects this, as it expects standard line endings (\r, \n, or \r\n) and throws an error if the delimiter character (|) is included in the terminator string.

### Desired behavior after PR is merged:
The "Inventory and Balance" report generates successfully without server errors. The code now uses the standard lineterminator='\n' to satisfy Python's validation rules. To maintain the mandatory trailing pipe (|) at the end of each row required by SUNAT, a dummy empty column (['']) is appended to the field names with restval=''. This prompts the writer to naturally append the final pipe as a column delimiter before the newline, resulting in the exact |\n output format required, safely and reliably.

opw-6509674

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