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.

.gitignore

@@ -0,0 +1,9 @@
+bin/
+obj/
+node_modules/
+fable_modules/
+src/Client/**/*.js
+src/Client/**/*.js.map
+.vs/
+*.user
+.env