chore: scaffold monorepo for EventSnap

- Rust/Axum backend skeleton with all crates, multi-stage Dockerfile
- SvelteKit + TypeScript frontend with Tailwind CSS v4, adapter-node, Dockerfile
- docker-compose.yml: db (postgres:16) → app → frontend → caddy with healthcheck and named volumes
- Caddyfile: TLS via Let's Encrypt, cache headers, API/media routing to backend
- .env.example: all environment variables documented with defaults
- README.md: project overview, features, stack, deploy guide, roadmap
- .gitignore: excludes secrets, build artifacts, node_modules, media uploads

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

backend/Dockerfile

@@ -0,0 +1,25 @@
+# --- Build stage ---
+FROM rust:1.87-alpine AS builder
+
+RUN apk add --no-cache musl-dev pkgconfig openssl-dev
+
+WORKDIR /app
+COPY Cargo.toml Cargo.lock* ./
+# Pre-fetch deps with a dummy build for layer caching
+RUN mkdir src && echo "fn main(){}" > src/main.rs && \
+    cargo build --release && \
+    rm -rf src
+
+COPY src ./src
+RUN touch src/main.rs && cargo build --release
+
+# --- Runtime stage ---
+FROM alpine:3.21
+
+RUN apk add --no-cache ca-certificates ffmpeg
+
+WORKDIR /app
+COPY --from=builder /app/target/release/eventsnap-backend ./
+
+EXPOSE 3000
+CMD ["./eventsnap-backend"]