feat: Electron desktop app, native ffmpeg export, fully static web

- apps/desktop: Electron shell serving the static web build over a
  privileged opencut:// protocol; exports stream frames over IPC to a
  bundled ffmpeg (libx264/libvpx-vp9, BT.709 tagged) with backpressure.
  electron-builder packaging: AppImage, deb, rpm.
- apps/web: dead backend deleted (better-auth, drizzle/pg, upstash,
  botid, freesound proxy, blog, rss, env validation); next build emits
  a zero-env static export; /editor/[project_id] -> /editor?project=.
- Native exporter mirrors SceneExporter; activates when the preload
  bridge is present; web keeps the mediabunny path.
- Docker self-hosting now builds and serves the static export via nginx.
- Release workflow: v* tags publish static web tarball + Linux packages.
- Changelog 0.4.0; README/AGENTS/CONTRIBUTING/roadmap updated.
- GPUI/Rust rewrite parked on branch rust-rewrite.

1 files changed, 18 insertions, 0 deletions

diff --git a/apps/desktop/scripts/copy-web.mjs b/apps/desktop/scripts/copy-web.mjs
new file mode 100644
index 00000000..f5f6f4f6
--- /dev/null
+++ b/apps/desktop/scripts/copy-web.mjs
@@ -0,0 +1,18 @@
+import { cpSync, existsSync, rmSync } from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const desktopDir = path.dirname(path.dirname(fileURLToPath(import.meta.url)));
+const source = path.join(desktopDir, "..", "web", "out");
+const target = path.join(desktopDir, "web");
+
+if (!existsSync(source)) {
+	process.stderr.write(
+		`Web bundle not found at ${source}. Run \`bun build:web\` first.\n`,
+	);
+	process.exit(1);
+}
+
+rmSync(target, { recursive: true, force: true });
+cpSync(source, target, { recursive: true });
+process.stdout.write(`Copied ${source} -> ${target}\n`);