chore: docker compose, mise.toml, updated toolchain

- Dockerfile: updated to serve mode with web/ embed, expose 8080
- docker-compose.yml: new, maps :8080 and output volume
- Makefile: added serve, akaiutil, electron-* targets
- mise.toml: new, go 1.26 + node 22, all build/run tasks
- .gitignore: exclude built akaiutil binary

docker-compose.yml

@@ -0,0 +1,9 @@
+services:
+  akai-utils:
+    build: .
+    ports:
+      - "8080:8080"
+    volumes:
+      - ./output:/data/output
+    environment:
+      - AKAIUTIL=/usr/local/bin/akaiutil