GHSA-vr5f-w35q-98jp: Perses's unvalidated project parameter enables filesystem path traversal

### Impact When Perses is using the file system database, on the list endpoints, the project value is bound from the request into the resource `Query` struct and is never validated against directory-traversal characters (validation/Flatten only runs for Create/Update bodies, not list queries). The path is then used to retrieve files in the database directly. Attacker can read arbitrary YAML/JSON files from the server host and can bypass the security constraints to get access to other resources contained in the file database. …