feat: add fluxer upstream source and self-hosting documentation

- Clone of github.com/fluxerapp/fluxer (official upstream)
- SELF_HOSTING.md: full VM rebuild procedure, architecture overview,
  service reference, step-by-step setup, troubleshooting, seattle reference
- dev/.env.example: all env vars with secrets redacted and generation instructions
- dev/livekit.yaml: LiveKit config template with placeholder keys
- fluxer-seattle/: existing seattle deployment setup scripts

fluxer/packages/marketing/src/components/icons/InfinityIcon.tsx

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/** @jsxRuntime automatic */
+/** @jsxImportSource hono/jsx */
+
+interface InfinityIconProps {
+	class?: string;
+}
+
+export function InfinityIcon(props: InfinityIconProps): JSX.Element {
+	return (
+		<svg
+			xmlns="http://www.w3.org/2000/svg"
+			viewBox="0 0 256 256"
+			fill="none"
+			stroke="currentColor"
+			stroke-linecap="round"
+			stroke-linejoin="round"
+			stroke-width="24"
+			class={props.class}
+		>
+			<path d="M101.28,158.17l-3.34,3.77a48,48,0,1,1,0-67.88l60.12,67.88a48,48,0,1,0,0-67.88l-3.34,3.77" />
+		</svg>
+	);
+}