Create missing parent folders for the file rate limiter path #585

Summary

FileRateLimitAdapter creates its storage folder with a non-recursive mkdir. When the configured path points to a folder whose parent does not exist, every request that goes through the rate limit middleware fails with a 500.

Current state (checked on master)

• FileRateLimitAdapter::__construct() calls $this->fs->makeDirectory($this->path) when path is not a directory (src/RateLimit/Adapters/FileRateLimitAdapter.php:46).
• LocalFileSystemAdapter::makeDirectory() returns mkdir($dirname), which does not create parent folders (src/Storage/Adapters/Local/LocalFileSystemAdapter.php:27).
• ViewCache already creates its folder recursively: mkdir($this->cacheDir, 0777, true) (src/ResourceCache/ViewCache.php:68).
• With path set to base_dir()/cache/data and no cache/ folder, the first request fails with mkdir(): No such file or directory. The starter project hit this on a fresh install (Align the project with framework 3.1 and fix the fresh-install API 500 project#203).

Proposed change

Create the whole path in FileRateLimitAdapter, with a recursive mkdir as ViewCache does. Nothing else changes: the shared makeDirectory() contract, which also has the Dropbox and Google Drive adapters, stays as it is.

Breaking changes

None. A path that already exists, or whose parent exists, behaves exactly as before.

Tests (first)

• In FileRateLimitAdapterTest: construct the adapter with a path whose parent folders do not exist and assert that the full path is created. Red on master, green after the change.

Acceptance criteria

• Constructing FileRateLimitAdapter with a path that has missing parents creates the whole path.
• The existing rate limiter tests pass unchanged.
• composer test, composer cs:check and composer phpstan pass.

Out of scope

• Making LocalFileSystemAdapter::makeDirectory() recursive for all callers (CronLock, ModuleManager, the console commands). That changes a shared primitive and needs its own decision.
• Throwing a clear error when the folder cannot be created at all (for example, permissions).