chore: address Copilot review comments

- Fix broken ADR link in docs/packages.md (remove docs/ prefix)
- Add missing README.md + LICENSE for rest-api-application and
  rest-api-runtime-adapter packages
- Clarify peer.updated vs peer.updated_milliseconds_ago in DTO docs
- Mark architecture documentation checkbox complete in issue spec

Part of EPIC #1669

Author: josecelano

docs/issues/open/1930-1669-si-33-rest-api-contract-first-architecture.md

@@ -434,4 +434,4 @@ Why discarded:
   - `rest-api-application`: `TorrentQueryPort` + `TorrentApiService` use case
   - `rest-api-runtime-adapter`: `TrackerTorrentQueryAdapter` + conversion functions
   - `axum-rest-api-server`: handler dispatches via use case instead of direct `tracker-core`
-- [ ] Target architecture documented in `docs/packages.md` (or a dedicated ADR).
+- [x] Target architecture documented in `docs/packages.md` and `docs/adrs/`. Verdict: ADR 20260623200526 + packages.md REST API section.

docs/packages.md

@@ -59,7 +59,7 @@ contrib/
 
 The REST API uses a **contract-first layered architecture** with four distinct
 layers and enforced dependency direction. See
-[ADR 20260623200526](docs/adrs/20260623200526_adopt_contract-first_architecture_for_rest_api.md)
+[ADR 20260623200526](adrs/20260623200526_adopt_contract-first_architecture_for_rest_api.md)
 for the full architectural decision and alternatives considered.
 
 ```mermaid

packages/rest-api-application/LICENSE

@@ -0,0 +1,11 @@
+# Torrust Tracker REST API Application
+
+Application/use-case layer for the Torrust Tracker REST API.
+
+## Documentation
+
+[Crate documentation](https://docs.rs/torrust-tracker-rest-api-application).
+
+## License
+
+The project is licensed under the terms of the [GNU AFFERO GENERAL PUBLIC LICENSE](./LICENSE).

packages/rest-api-application/README.md

@@ -8,10 +8,10 @@ pub struct Peer {
     pub peer_id: Id,
     /// The peer's socket address. For example: `192.168.1.88:17548`.
     pub peer_addr: String,
-    /// The peer's last update time in milliseconds.
+    /// The peer's last update time as a Unix timestamp in milliseconds since epoch.
     #[deprecated(since = "2.0.0", note = "please use `updated_milliseconds_ago` instead")]
     pub updated: u128,
-    /// The peer's last update time in milliseconds.
+    /// Milliseconds since the peer's last update (relative to the response generation time).
     pub updated_milliseconds_ago: u128,
     /// The peer's uploaded bytes.
     pub uploaded: i64,

packages/rest-api-protocol/src/v1/resources/peer.rs

@@ -0,0 +1,11 @@
+# Torrust Tracker REST API Runtime Adapter
+
+Tracker-specific runtime adapter for the REST API application layer.
+
+## Documentation
+
+[Crate documentation](https://docs.rs/torrust-tracker-rest-api-runtime-adapter).
+
+## License
+
+The project is licensed under the terms of the [GNU AFFERO GENERAL PUBLIC LICENSE](./LICENSE).