Use Caddy to serve localhost HTTPS

Caddyfile

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+# Caddy v2 configuration for local development (HTTPS on localhost)
+# Reverse-proxy to the bot service and serve static assets.
+# Uses Caddy's internal CA to generate a self-signed certificate for localhost.
+
+# HTTP -> HTTPS redirect for local development
+:80 {
+	redir https://localhost{uri}
+}
+
+# Local HTTPS site with self-signed cert
+localhost {
+	encode zstd gzip
+	# Issue a locally-trusted certificate via Caddy's internal CA
+	tls internal
+
+	# Serve static files under /static from the mounted volume
+	handle_path /static* {
+		root * /var/www/reminder-rs/static
+		file_server
+	}
+
+	# Proxy everything else to the bot service inside the Docker network
+	reverse_proxy bot:18920
+}