chore(ai-gateway): remove Cloudflare analytics

[chrarnoldus]

Summary

• remove Cloudflare Analytics API metric emission from chat, embeddings, transcription, and security-agent LLM requests
• remove response cloning/draining and request tool telemetry used only by the observability integration
• delete the obsolete API metrics implementation and its tests while preserving billing usage, Sentry telemetry, and the shared O11Y service

Verification

• local tests not run; CI will handle verification as requested
• pnpm format:changed
• git diff --check

Visual Changes

N/A

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

This change removes the Cloudflare/o11y API-metrics emission and its helpers across the AI gateway and security-agent services; cross-reference verification found no dangling imports, orphaned call sites, or newly-unused locals on the changed lines.

Files Reviewed (11 files)

• apps/web/src/app/api/openrouter/[...path]/route.test.ts
• apps/web/src/app/api/openrouter/[...path]/route.ts
• apps/web/src/app/api/openrouter/audio/transcriptions/route.test.ts
• apps/web/src/app/api/openrouter/audio/transcriptions/route.ts
• apps/web/src/app/api/openrouter/embeddings/route.ts
• apps/web/src/lib/ai-gateway/o11y/api-metrics.server.test.ts
• apps/web/src/lib/ai-gateway/o11y/api-metrics.server.ts
• apps/web/src/lib/ai-gateway/providers/upstream-attempt.ts
• apps/web/src/lib/security-agent/services/analysis-service.ts
• apps/web/src/lib/security-agent/services/extraction-service.ts
• apps/web/src/lib/security-agent/services/triage-service.ts

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_{Reviewed by deepseek-v4.1-flash · Input: 0 · Output: 0 · Cached: 0}

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