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

mise.toml

@@ -0,0 +1,19 @@
+[tools]
+go = "1.26"
+node = "22"
+
+[env]
+CGO_ENABLED = "0"
+
+[tasks]
+build = "go build -buildvcs=false -o fetch ."
+akaiutil = "make -C third_party/akaiutil"
+all = { run = "go build -buildvcs=false -o fetch . && make -C third_party/akaiutil" }
+serve = { run = "go build -buildvcs=false -o fetch . && ./fetch serve" }
+lint = "go vet ./..."
+electron-deps = "cd electron && npm install"
+electron-dev = { run = "go build -buildvcs=false -o fetch . && cd electron && npx electron ." }
+electron-build = { run = "go build -buildvcs=false -o fetch . && make -C third_party/akaiutil && cd electron && npx electron-builder --dir" }
+electron-build-mac = { run = "go build -buildvcs=false -o fetch . && make -C third_party/akaiutil && cd electron && npx electron-builder --mac --dir" }
+docker-up = "docker compose up --build"
+docker-build = "docker build -t akai-fetch ."