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/Client/Shared/Format.fs

@@ -0,0 +1,12 @@
+module Client.Shared.Format
+
+/// Whole-numbered points render without a decimal point ("3"); anything with
+/// a fractional part renders with one decimal place ("2.5") — points are
+/// usually whole in this app, but `AverageAttempt` grading or a partial-point
+/// question config can produce a fractional value that a blanket "%.0f"
+/// would otherwise silently round away.
+let points (value: float) : string =
+    if value = System.Math.Round value then
+        sprintf "%.0f" value
+    else
+        sprintf "%.1f" value