fix: [event_delegation] Add serde renames for Org/RequesterOrg fields

[elhoim]

BLUF — MispEventDelegation lacked serde renames, so Org and RequesterOrg deserialized to None.

• Problem — MISP's EventDelegation.php $belongsTo aliases the organisations as Org and RequesterOrg, but the org/requester_org fields in src/models/event_delegation.rs matched only lowercase keys and silently deserialized to None.
• Fix — Adds #[serde(rename = "Org")] and #[serde(rename = "RequesterOrg")] to the two fields, plus a deserialization test asserting both populate from capitalized MISP-shaped JSON.
• Effect — Delegation records carry the delegating and requesting organisations instead of dropping them.
• CI — Red from a known repo CI bug (an ubuntu-22.04 runner with no php8.3 mod_php, plus a publish-worker race in test_event_crud_lifecycle), fixed in PR fix: [ci] Run integration tests on ubuntu-24.04 to match php8.3 #53 and unrelated to this PR.

Finding

org/requester_org lack rename to Org/RequesterOrg
MISP EventDelegation.php $belongsTo uses 'Org' and 'RequesterOrg'; both fields silently deserialize to None.

Change

MISP's EventDelegation.php $belongsTo declares aliases 'Org' and 'RequesterOrg', so API responses nest organisation details under capitalized keys. MispEventDelegation's org/requester_org fields lacked serde renames and matched only lowercase keys, so they silently deserialized to None. Added #[serde(rename = "Org")] and #[serde(rename = "RequesterOrg")] to the two fields, and added a new deserialization test asserting both fields populate correctly from capitalized MISP-shaped JSON.

Upstream evidence

MISP core app/Model/EventDelegation.php:21-30 — public $belongsTo = array('Event', 'Org' => array('className' => 'Organisation'), 'RequesterOrg' => array('className' => 'Organisation'), 'SharingGroup');

Verified against MISP core 843b6744 and PyMISP e7debb4f.

Tests

• event_delegation_deserialize_org_fields

Caveats

Minimal, self-contained field-level serde fix; no dependency on other findings.

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Verified locally: cargo fmt --check, cargo clippy --all-targets --all-features -- -D warnings, cargo test --all-features --lib, --test integration_tests --no-run, and cargo check --examples, each in an isolated target directory.

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