Make the rating optional so a seller reply does not leave one

[zlexdev]

orders/review serves two different acts and the endpoint does not tell them apart: as the buyer you leave or edit a review with a rating, as the seller you reply and the site posts rating= empty.

Review models only the first. rating is a required Literal[0, 1, 2, 3, 4, 5], and rating or '' in make_data makes 0 the only way to express "none".

So a seller reply has to be built as rating=0. The site accepts it and records it as the sender's rating on that order. Nothing raises, and it is visible only on the order page afterwards.

Repro

On dev:

await bot.review(order_id="...", text="thanks", rating=0)

posts rating= empty — indistinguishable at the call site from meaning to rate, because 0 is also the value you would pass if you did.

What this changes

• rating becomes optional and narrows to 1..5;
• reply_review: bool = False states that this is a reply;
• omitting the rating without saying so raises ReviewRatingRequiredError at construction, before a request goes out.

The request body is unchanged: a reply still posts rating= empty, a review still posts its number. Verified field by field against a request captured from the site.

tests/ is new — the Makefile already points TESTS at it. Four tests; test_omitting_the_rating_without_saying_it_is_a_reply_is_refused is the one that cannot pass on the parent commit.

Named ReviewRatingRequiredError rather than ReviewRatingRequired to match RefundError / RaiseOffersError and ruff's N818.

Not included

ruff check reports 13 pre-existing findings elsewhere in the tree. They are left alone so this diff stays about one thing.