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.

.env.example

@@ -0,0 +1,8 @@
+# Copy to .env (gitignored) and fill in before running `docker-compose up`.
+
+# Any string works for local dev; use a long random value for anything
+# beyond that.
+JWT_SECRET=dev-secret-change-me-please-32-chars-min
+
+# Optional — defaults to "devpassword" if unset.
+POSTGRES_PASSWORD=devpassword