fix: implement get_all_reviews_for_user, add crate metadata

Replace todo!() stubs in sqlite/postgres adapters with
actual queries. Add description+license to presentation crate.

crates/presentation/Cargo.toml

@@ -2,6 +2,8 @@
 name = "presentation"
 version = "0.1.0"
 edition = "2024"
+description = "Self-hosted movie diary with REST API and ActivityPub federation"
+license = "MIT"
 
 [features]
 default = ["sqlite", "sqlite-federation"]