build: turn the repo into a Turborepo monorepo with uv workspaces

[userAugustos]

Goal

Make the repository a real monorepo. Turborepo is the build system. uv workspaces hold the Python packages. Every command runs from the root through Turborepo.

This is the first PR of a stack. It covers layout, workspace, and build system only. It does not fix code, tests, or CI coverage.

Acceptance Criteria

• The root holds package.json, bun.lock, turbo.json, a virtual pyproject.toml, and uv.lock.
• packages/core holds the runtime distribution canyonos-core. packages/cli holds the CLI distribution canyonos. Both are uv workspace members.
• Turborepo discovers both Python packages from the uv workspace with its native Python support. No Python package carries a package.json.
• bun install and uv sync from the root prepare the whole repo. There is one shared virtual environment at the root.
• bun run lint, bun run typecheck, bun run check, bun run format, bun run test, and bun run build run from the root and go through turbo run.
• bun run build produces the wheel and sdist of both packages.
• The canyonos console script resolves from the root environment.
• Each tool version is pinned in one place: Bun in package.json, Turborepo in bun.lock, uv in the root pyproject.toml, Ruff and ty in the dev group.
• uv.lock is regenerated with the pinned uv, tracked, and no longer listed in .gitignore.
• The core image builds from packages/core. The core image workflow watches the new paths.
• The CLI release workflows build the binaries and the wheel and publish from packages/cli.
• The CI workflow runs lint, format, and type checks through the root commands.
• README files, the install script, and the architecture docs point to the new paths.
• Source files change only where the move requires a new path.

Guidance

• The PR is based on PR refactor: make CI lint, format, type checks, and runtime tests pass #100 and opens after refactor: make CI lint, format, type checks, and runtime tests pass #100 merges.
• The layout and the root scripts follow the canyon-os repository.
• Commit messages and the PR title use conventional commits.
• Code comments only where the code cannot say it.

Known problems accepted in this PR

• Core test modules that import the generated gRPC stubs or gpu_metrics do not collect outside the Docker image. This is the state today. bun run test is red for core. A later PR in the stack fixes collection.
• Tests stay in the root tests directory and run as one task. A later PR moves them into the packages.
• CI does not run pytest. This is the state today. A later PR adds it.
• The CLI auto-bump workflow edits the CLI version without refreshing uv.lock. This PR adds the lock refresh to the bump step. A better release flow is a later PR.
• Turborepo Python support is experimental. It needs a future flag and uv 0.12 or newer.