fix(audit): serialize provider audited attributes in queries

[chalabi2]

Description

Closes: akash-network/support#606

Fixes malformed provider audit attribute query responses by decoding stored
audit values as AuditedAttributesStore and reconstructing owner and
auditor from the store key.

The current query implementation decodes audit store values as
AuditedProvider. Since AuditedAttributesStore.attributes and
AuditedProvider.owner are both protobuf field 1, all-provider and
auditor-filtered queries return attribute bytes in the owner field while
auditor and attributes are empty.

Critical files to review:

• x/audit/keeper/grpc_query.go
• x/audit/keeper/grpc_query_test.go
• x/audit/keeper/keeper.go

Validation:

• GOWORK=off go test ./x/audit/keeper -count=1
• GOWORK=off go test ./x/audit/... -count=1

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow-up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
  • Not applicable: this is not an API or client breaking change.
• targeted the correct branch (see PR Targeting)
  • Targeting main for normal review and merge.
• provided a link to the relevant issue or specification
  • No GitHub issue exists; this was reported in Slack on 2026-06-03.
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
  • Not applicable: narrow query serialization fix for an RC branch.
• included comments for documenting Go code
  • Not applicable: no exported API or new Go doc surface.
• updated the relevant documentation or specification
  • Not applicable: no documentation/spec change.
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed
  • Pending PR CI.

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