feat: complete basic templates and features

[sdevil7th]

Summary

• added support ubuntu and AMD rocm
• completed generating the templates
• modified the nodes, improved the UX, made them generalised
• and other features mentioned in the demo

Checks

• uv lock --check
• uv pip check
• uv run python -m modiff.preflight --json --check-port 8088 --fail-on-error
• uv run python -m unittest discover -s tests -v
• bash -n run.sh when a POSIX shell is available

Compatibility, Security, And Proof

• Existing graph, HTTP, WebSocket, storage, and mellon import compatibility is preserved or the migration is described.
• Client-facing changes include the matching MoDiff-client change and bundled-client update plan.
• File access, custom code, model loading, tokens, origins, and request-size implications were reviewed where relevant.
• Unit/contract, registry, live backend, accelerator, and real model-generation evidence are reported separately.
• Documentation was updated for changed commands, extras, routes, configuration, storage, or trust boundaries.
• No credentials, private media, personal paths, machine inventories, or unredacted provenance are included.