Require login to create events when auth is enabled

Gate the home page and POST /events behind auth. Also add sqlite3 CLI
to the Docker image for DB inspection, and gitignore test.db files.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Dockerfile

@@ -6,7 +6,7 @@ COPY . .
 RUN CGO_ENABLED=1 go build -o /bbq .
 
 FROM debian:bookworm-slim
-RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/*
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates sqlite3 && rm -rf /var/lib/apt/lists/*
 COPY --from=build /bbq /usr/local/bin/bbq
 VOLUME /data
 ENV BBQ_DB=/data/bbq.db