[Feature]: Change all api routes to use proper names for IDs

[scottdykes1611]

Product

Sensabill

Is your feature request related to a problem? Please describe.

In API routes, "id" is often used where "clientId" or "supplierId" (etc.) should be used instead

These ids are therefore not used in auth middleware

Describe the solution you'd like.

• Change all IDs to use the proper name: such as "clientId"
• Do rigorous testing to make sure everything still works as it should for all user types

Describe alternatives you've considered.

No response

Checked for existing ticket

• I confirm I have checked to see that this feature has not already been requested.
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