Complete AI gateway state migration by removing Redis mirrors

[chrarnoldus]

Summary

• remove compatibility Redis writes for gateway routing config, provider-sync state, stale-alert state, and request-logging opt-ins after Move AI gateway state source of truth from Redis to PostgreSQL #5970 moved reads to PostgreSQL
• delete the now-unused Redis key constants and their key-name tests
• retain PostgreSQL row locking for concurrent authoritative state mutations
• preserve the database-backed three-day stale-alert repeat interval

The legacy Redis values will expire naturally according to the TTLs applied before this cleanup.

Verification

• formatted changed files with oxfmt
• git diff --check
• test, typecheck, and lint suites left to CI

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Removed leftover Redis mirrors for AI gateway routing, provider-sync, stale-alert, and request-logging state; PostgreSQL remains the sole source of truth and no leftover Redis readers were found.

Files Reviewed (7 files)

• apps/web/src/lib/ai-gateway/providers/openrouter/sync-providers-stale-alert.test.ts
• apps/web/src/lib/ai-gateway/providers/openrouter/sync-providers-stale-alert.ts
• apps/web/src/lib/ai-gateway/providers/openrouter/sync-providers.ts
• apps/web/src/lib/ai-gateway/request-logging-opt-ins.ts
• apps/web/src/lib/redis-keys.test.ts
• apps/web/src/lib/redis-keys.ts
• apps/web/src/routers/admin/gateway-config-router.ts

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_{Reviewed by grok-4.6 · Input: 94.7K · Output: 7.2K · Cached: 278.8K}

_{Review guidance: REVIEW.md from base branch main}