added api logic, vitest, minimal testing ui

Caddyfile.dev

@@ -0,0 +1,28 @@
+# Caddyfile.dev — local development (HTTP only)
+{
+  auto_https off
+  admin off
+}
+
+:80 {
+  # Logs to stdout (handy in `docker compose logs caddy`)
+  log {
+    output stdout
+    format console
+  }
+
+  # Health-check / sanity page for the proxy itself
+  respond / "caddy ok" 200
+
+  # Proxy API: strip /api prefix and forward to the api service on 8080
+  handle_path /api/* {
+    reverse_proxy api:8080
+  }
+
+  # Helpful headers, even in dev
+  header {
+    X-Content-Type-Options "nosniff"
+    Referrer-Policy "strict-origin-when-cross-origin"
+  }
+}
+}