test: add comprehensive unit tests to platform-server (+289 tests)

- Add 14 tests for auth.rs (signature verification, timestamps)
- Add 15 tests for bridge.rs (URL routing, error handling)
- Add 17 tests for validators.rs (request parsing, validation)
- Add 10 tests for submissions.rs (query parsing, deprecation)
- Add 12 tests for events.rs (broadcast, secrets)
- Add 10 tests for evaluations.rs (request/response serialization)
- Add 11 tests for leaderboard.rs (query parsing)
- Add 20 tests for websocket/events.rs (EventBroadcaster)
- Add 20 tests for websocket/handler.rs (auth flow)
- Add 20 tests for websocket/challenge_handler.rs (message routing)

Total workspace tests: 1631 -> 1920
Platform-server tests: 61 -> 206

Author: echobt

Cargo.lock

@@ -76,6 +76,10 @@ clap = { version = "4.5", features = ["derive", "env"] }
 
 # Testing
 tempfile = "3.12"
+mockall = "0.13"
+wiremock = "0.6"
+rstest = "0.23"
+tokio-test = "0.4"
 
 # HTTP/Web (for platform-server)
 reqwest = { version = "0.12", features = ["json"] }

Cargo.toml

@@ -58,3 +58,10 @@ reqwest = { version = "0.12", features = ["json"] }
 # Concurrency
 parking_lot = { workspace = true }
 dashmap = "6.0"
+
+[dev-dependencies]
+mockall = { workspace = true }
+wiremock = { workspace = true }
+rstest = { workspace = true }
+tokio-test = { workspace = true }
+tempfile = { workspace = true }