fix: resolve golangci-lint errors (batch 1)
- cmd/gitea-cli: fix errcheck, perfsprint, use modules/json, http constants
- models/migrations: remove unused nolint directive
- models/organization: interface{} -> any
- modules/health: rename HealthResponse -> Response to avoid stutter
- modules/idempotency: use modules/json, fix errcheck, rename IdempotencyInfo -> Info
- modules/structs: fix Verified_At naming, use omitzero
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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