Initial commit: standalone quiz-testing system

Full-stack F# (Domain/Server/Client via Fable+Elmish+Feliz), PostgreSQL
persistence via Dapper, Docker Compose deployment. Student quiz-taking flow
with time-limit enforcement and focus-loss tracking, Teacher question bank
and quiz builder with results analytics, Admin user management.

src/Domain/Features/FinishAttempt.fs

@@ -0,0 +1,11 @@
+namespace Domain.Contracts
+
+open Domain
+
+type AttemptResult =
+    { AttemptId: AttemptId
+      Score: float
+      MaxScore: float
+      Passed: bool option }
+
+type FinishAttemptRequest = { AttemptId: AttemptId }