Add docs for state management conventions covering React Query cache keys and invalidation patterns

[Chucks1093]

Summary

The client uses React Query for all server state but there are no documented conventions for query key structure or cache invalidation patterns. Contributors adding new queries or mutations end up with inconsistent key formats and unpredictable invalidation behaviour.

Scope

• Document the query key naming convention used across the client (e.g. [entity, id, scope] format)
• Explain when to use invalidateQueries vs setQueryData for cache updates after mutations
• Show an example of a query key factory for a new entity type
• Describe the stale time and cache time defaults and when to override them

Acceptance Criteria

• Query key naming convention documented with examples
• Invalidation vs setQueryData decision explained
• Query key factory example included
• Stale time and cache time defaults documented with override guidance
• Document lives in docs/ and cross-links the page contribution guide

ETA: 12 hours

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[KingDavid9999]

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[dhareymu]

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Hi maintainer,

Please, I would love to work on this project to fix the issues for you. I promise to work on it swiftly and create a PR for it in no time.

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[amina69]

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hii, let me work on this

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[onajidavid87-web]

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i wuld love to work on this issue

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[edehvalentine236-jpg]

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Kindly assign.

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[abimbolaalabi]

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I'd like to work on this issue. Could you please assign it to me?

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[grantfox-oss]

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@onajidavid87-web's PR #608 was approved and merged by @Chucks1093.

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