feat: Add API methods for uncovered DM and AS endpoints

[claude-im]

Summary

Audited every endpoint path in DmApi (dm_api.py) and AsApi (as_api.py) against the live OpenAPI specs (squonk.it/data-manager-api and squonk.it/account-server-api), then wrapped the endpoints that had no client method.

Bug fix

• DmApi.get_dataset_for_digest() was calling GET /type (which in DM 5.x is "Get the supported File Types" and ignores the digest). Repointed at the dedicated GET /digest/dataset/{digest}.

New DmApi methods (31)

• Datasets — create_dataset_from_project_file, upload_dataset, get_dataset, delete_dataset, get_dataset_versions, get_dataset_metadata, update_dataset_metadata, get_dataset_version_metadata, update_dataset_version_metadata, get_dataset_schema, add_dataset_editor, remove_dataset_editor
• Files — attach_dataset_to_project, move_project_file, get_project_file, delete_project_file
• Users/account — get_users, get_admin_users, get_account, get_api_log, get_api_token, create_user_account, delete_user_account, update_user_account
• Project admins — add_project_administrator, remove_project_administrator
• Instances/tasks — update_instance, delete_task
• Job manifests — get_job_manifests, load_job_manifests, delete_job_manifest

New AsApi method (1)

• get_charges() (GET /charges, all organisations), mirroring get_organisation_charges().

Docs / tests

• README.rst method lists updated (alphabetical, per convention).
• docs/ needs no change — automodule … :members: picks up the new methods.
• test.py exercises the read-only get_account() / get_api_token().

Not included

• AS PUT /unit / DELETE /unit — spec labels them "Create/Deletes a new Personal Unit", duplicating the existing create_personal_unit() / delete_personal_unit().

Verification

• uv run pre-commit run --all-files — ruff, ruff-format, ty, pyroma, commitizen all pass.
• Re-ran the endpoint audit: 99 DmApi + 53 AsApi call sites, every method+path validated against the live specs, 0 problems.

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