feat(pyoaev): adapt endpoint and AI target APIs to the asset taxonomy remodel (#307)

[SamuelHassine]

Summary

Adapts pyoaev to the OpenAEV asset taxonomy remodel (OpenAEV-Platform/openaev#6704), where AiTarget is merged into Asset and network fields move to the asset level:

• EndpointManager create/upsert attributes now send asset_hostname / asset_ips / asset_mac_addresses / asset_url (endpoint_platform / endpoint_arch stay endpoint-scoped), matching the backend EndpointInput wire names.
• AiTargetManager identifies AI targets by asset_id and sends asset_name + ai_target_* attributes against the /ai_targets facade; the credential attribute is renamed ai_target_api_key_variable -> ai_target_token to match the backend AiTargetInput.
• New ContractAiTarget contract field type (ai-target) so injector contracts can render a platform AI target picker instead of a free-text ID field; its docstring clarifies the selected value is the AI target's asset_id.
• Tests updated to the renamed keys (160 tests green).

BREAKING CHANGE: consumers building endpoint payloads with the old endpoint_hostname / endpoint_ips / endpoint_mac_addresses / endpoint_url keys must switch to the asset_* keys, and ai_target_api_key_variable must become ai_target_token. Requires an OpenAEV backend that includes the asset taxonomy remodel.

Closes #307

Test plan

• python -m pytest (160 passed)
• isort --check-only . and black --check . clean locally; CircleCI ensure_formatting / linter / test / build green
• Smoke test an injector/collector using this branch against a remodeled OpenAEV instance

[Copilot]

Pull request overview

This PR updates the pyoaev client to align with OpenAEV’s asset taxonomy remodel by moving network-identifying fields to the asset level and treating AI targets as AI_TARGET-category assets behind the /ai_targets facade.

Changes:

• Renames endpoint network fields in endpoint create/upsert payloads from endpoint_* to asset_*.
• Updates AI target API handling to identify targets by asset_id and adjusts allowed create attributes.
• Adds a new injector contract field type ai-target for selecting AI target assets via UI picker.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
test/apis/endpoint/test_endpoint.py	Updates endpoint upsert test payload to use asset_url.
pyoaev/contracts/contract_config.py	Adds ContractFieldType.AiTarget and new ContractAiTarget contract element.
pyoaev/apis/endpoint.py	Updates endpoint create attribute whitelist to use asset_hostname/asset_ips/asset_mac_addresses/asset_url.
pyoaev/apis/ai_target.py	Treats AI targets as assets (asset_id) and updates allowed AI target attributes.

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[SamuelHassine]

Review and fix pass complete:

• Independent review of all 4 changed files against the backend (EndpointInput, AiTargetInput, ContractFieldType): the asset_* / ai_target_token wire names and the new ai-target contract field type all match the remodeled API exactly.
• Addressed the Copilot review comment: the ContractAiTarget docstring now says the selected value is the AI target's asset_id (commit 89b79b6); thread replied and resolved.
• PR description refreshed to mention the ai_target_api_key_variable -> ai_target_token rename in the breaking-change note.
• CI fully green on the latest commit: GitHub Actions (signed commits, linked issue, PR title, coverage), CircleCI (ensure_formatting, linter, test, build), codecov patch/project, Snyk, CLA.
• Local verification: python -m pytest (160 passed), isort --check-only and black --check clean.

Remaining before merge: one approving review is required (branch protection blocks self-approval by the author), and the optional smoke test of an injector/collector against a remodeled OpenAEV instance is still unchecked in the test plan.