Function extract_odata_query 

pub async fn extract_odata_query<S>(
    parts: &mut Parts,
    state: &S,
) -> Result<ODataQuery, Problem>
where
    S: Send + Sync,

Extract and validate full OData query from request parts.

• Parses $filter, $orderby, limit, cursor
• Enforces budgets and validates formats
• Returns unified ODataQuery

Errors

Returns Problem if any OData parameter is invalid.