fix(agentd): ignore client approval grants in production

[EfeDurmaz16]

Summary

• prevent production /v1/authorize from trusting caller-supplied approvalGranted
• keep non-production behavior available for local simulation and CLI smoke workflows
• document the production behavior in the agentd OpenAPI schema

Verification

• pnpm --filter @fides/agentd test
• pnpm --filter @fides/agentd lint
• pnpm --filter @fides/agentd build
• git diff --check