[REF] all: pass pre-commit on the whole repo

Needed for the lint job of the CI to go green. Mostly automatic hook
fixes (black, isort, prettier, pyupgrade, autoflake, whitespace). By hand:

- flake8: two unused imports, an ambiguous variable name `l`.
- pylint-odoo mandatory: manifest keys equal to their default value
  (installable, application, data, external_dependencies).
- end-of-file-fixer skips *.patch too, like trailing-whitespace: the
  upstream patches stay as git format-patch wrote them.

No behaviour change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

website_membership_signup_required/static/src/js/website_membership_signup_required.js

@@ -38,4 +38,4 @@ publicWidget.registry.WebsiteSale.include({
         }
         return data;
     },
-});
+});

website_membership_signup_required/static/tests/tours/website_membership_signup_required.js

@@ -64,8 +64,9 @@ registry.category("web_tour.tours").add("website_membership_signup_required_tour
             run: "click",
         },
         {
-            content: "Submit the signup form -> redirect straight to cart "
-                     + "with the product already added (post-login auto-add)",
+            content:
+                "Submit the signup form -> redirect straight to cart " +
+                "with the product already added (post-login auto-add)",
             trigger: ".oe_signup_form button[type='submit']",
             run: "click",
             expectUnloadPage: true,
@@ -108,4 +109,4 @@ registry.category("web_tour.tours").add("website_membership_signup_required_non_
         tourUtils.goToCart(),
         tourUtils.assertCartContains({ productName: "Regular Test Product" }),
     ],
-});
+});