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/src/main.rs

@@ -0,0 +1,27 @@
+use anyhow::Result;
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    dotenvy::dotenv().ok();
+
+    tracing_subscriber::registry()
+        .with(tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| {
+            "eventsnap_backend=debug,tower_http=debug".into()
+        }))
+        .with(tracing_subscriber::fmt::layer())
+        .init();
+
+    let port: u16 = std::env::var("APP_PORT")
+        .unwrap_or_else(|_| "3000".to_string())
+        .parse()?;
+
+    let router = axum::Router::new()
+        .route("/health", axum::routing::get(|| async { "ok" }));
+
+    let listener = tokio::net::TcpListener::bind(("0.0.0.0", port)).await?;
+    tracing::info!("listening on {}", listener.local_addr()?);
+    axum::serve(listener, router).await?;
+
+    Ok(())
+}