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, 7 insertions, 3 deletions

diff --git a/justfile b/justfile
index 9c264b8a..eea359d2 100644
--- a/justfile
+++ b/justfile
@@ -52,7 +52,7 @@ verify:
     cd apps/web && bunx tsc --noEmit
     bun build:web
 
-# Build the Rust WASM package (run ./script/setup-rust once first)
+# Build the Rust WASM package (requires rustup + wasm-pack)
 wasm:
     bun build:wasm
 
@@ -64,9 +64,13 @@ wasm-watch:
 rust-test crate:
     cargo test -p {{crate}}
 
-# Run the GPUI desktop app (after apps/desktop/script/setup)
+# Run the Electron desktop app (requires apps/web/out via bun build:web + just desktop-web)
 desktop:
-    cargo run -p opencut-desktop
+    bun run --cwd apps/desktop dev
+
+# Copy the static web bundle into the desktop app
+desktop-web:
+    bun run --cwd apps/desktop copy:web
 
 # Start optional local services (postgres, redis) — not needed for editor work
 services: