test(14.2-04): uploads mount and access log unit tests; the uploads route owns its prefix

- TestUploadsMount: key off registers nothing; on, a public blob is served
  with its content type and nosniff, HEAD has no body, private, missing,
  partition and encoded traversal paths 404, an unpublished bucket or
  database 404s, a custom prefix is honoured
- mountUploads refuses a plugin route at or under the prefix, so
  BuildRouter fails instead of only an identical pattern failing at
  Assemble (README and storage docs updated)
- TestAccessLog: pattern and status for 200, handler 404 and recovered
  panic, path only for unmatched requests, locale-prefixed requests keep
  the pattern, integer duration_ms, no query, header or Authorization
  value, ResponseController flush still works

modules/surf/README.md

@@ -34,7 +34,7 @@ Use cases:
 - Path-scoped CORS configured with the same keys as Laravel's `config/cors.php` (`surf.CORSConfig`), including preflight handling. Every `OPTIONS` request on a CORS path is answered with 204 before routing, with the headers Laravel's `HandleCors` sends: `Cache-Control: no-cache, private` always and, on a preflight (an `Origin` and an `Access-Control-Request-Method`), the requested method (upper-cased) and headers echoed in `Access-Control-Allow-Methods` and `Access-Control-Allow-Headers` when `*` allows any, `Vary` on the request headers and PHP's default `Content-Type: text/html; charset=UTF-8`.
 - Optional `surf.LocaleResolver`: a compiled plugin publishes the interface through backpack; surf looks it up without importing the plugin. When present, it may strip an enabled locale prefix before routing and writes a validated code with `towel.WithLocale`. When absent, hosts keep the raw `Accept-Language` header and `surf.LocaleFromPrincipal` overlay.
 - `surf.LocaleFromPrincipal` switches the request locale to the signed-in user's preferred locale.
-- Opt-in uploads route: with `storage.uploads.serve` true, `surf.BuildRouter` mounts `GET <storage.uploads.public_path_prefix>/{path...}` (owned by `summercms.surf`) on `attach.StaticHandlerPublic`, so a file is served only when its `system_files` row is public, and every response carries `X-Content-Type-Options: nosniff`. The bucket and the database are looked up per request, so `route:list` lists the route without opening either; until `serve` publishes them it answers 404. A plugin route on the same pattern fails boot as a duplicate.
+- Opt-in uploads route: with `storage.uploads.serve` true, `surf.BuildRouter` mounts `GET <storage.uploads.public_path_prefix>/{path...}` (owned by `summercms.surf`) on `attach.StaticHandlerPublic`, so a file is served only when its `system_files` row is public, and every response carries `X-Content-Type-Options: nosniff`. The bucket and the database are looked up per request, so `route:list` lists the route without opening either; until `serve` publishes them it answers 404. The route owns the whole prefix: `surf.BuildRouter` fails when a plugin route sits at or under it.
 - Opt-in request log: with `http.access_log` true, every request writes one Info record `http request` after it is served, with `method`, `pattern` (the matched route, such as `GET /posts/{id}`), `status` and `duration_ms`. A 5xx written after the client cancelled the request is logged with status 499 (client closed request). Only an unmatched request (a 404 or 405 from the mux, or a CORS preflight answered before routing) adds `path`, without the query string. The query string, headers, the client address and a matched route's raw path are never logged. Records go to the app's published `*slog.Logger`, else `slog.Default`, so the [sunscreen](../sunscreen/README.md) redaction still applies.
 - A read-only route table (`surf.Router.Routes`), the admin mount status (`surf.Router.AdminPrefix`) and the `serve` and `route:list` commands.