Release 0.1.0: MIT license, changelog, multi-arch Docker image without CLI builds

- LICENSE (MIT), CHANGELOG for 0.1.0, README overhaul
- docker-compose.release.yml pulling the registry image
- Dockerfile cross-compiles the server with cargo-zigbuild for amd64 and arm64;
  the terminal client is no longer built into the image
- Server, install script and settings point to a source install of the
  terminal client when no prebuilt binaries are available (/info: cli_builds)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/Cargo.toml

@@ -3,6 +3,8 @@ name = "codecraft"
 version = "0.1.0"
 edition = "2024"
 description = "Web-based coding harness for AI models"
+license = "MIT"
+repository = "https://git.familie-zink.org/zink/codecraft"
 
 [dependencies]
 codecraft-core = { path = "../core" }