Initial release: Disc Agenda frisbee tournament platform

Full-stack tournament management app with real-time scoring:
- Go 1.26 backend with REST API and WebSocket live scoring
- React 19 + Vite 8 frontend with mobile-first design
- File-based JSON storage with JSONL audit logs
- Multi-stage Docker build with Gitea CI/CD pipeline
- Post-tournament questionnaire with spirit voting
- Technical documentation and project description

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,42 @@
+# ---- Stage 1: Build frontend ----
+FROM node:22-alpine AS frontend-build
+WORKDIR /app/frontend
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npx vite build
+
+# ---- Stage 2: Build Go backend ----
+FROM golang:1.26-alpine AS backend-build
+WORKDIR /app/backend
+COPY backend/go.mod backend/go.sum ./
+RUN go mod download
+COPY backend/ ./
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /server ./cmd/server
+
+# ---- Stage 3: Runtime ----
+FROM alpine:3.21
+RUN apk add --no-cache ca-certificates tzdata
+WORKDIR /app
+
+COPY --from=backend-build /server /app/server
+COPY --from=frontend-build /app/frontend/dist /app/static
+COPY data/ /app/data-seed/
+
+EXPOSE 8080
+
+ENV PORT=8080
+ENV DATA_DIR=/app/data
+
+# Copy seed data on first run if /app/data is empty (volume mount)
+COPY <<'EOF' /app/entrypoint.sh
+#!/bin/sh
+if [ ! -f /app/data/tournaments.json ]; then
+  echo "Seeding initial data..."
+  cp -r /app/data-seed/* /app/data/
+fi
+exec /app/server -static /app/static -data /app/data
+EOF
+RUN chmod +x /app/entrypoint.sh
+
+ENTRYPOINT ["/app/entrypoint.sh"]