perf(effect): lazily initialize HTTP API routes

[Makisuo]

Summary

• Compile each Effect HTTP endpoint's codecs and middleware on the first request to that route.
• Generate Scalar, Swagger, and openapiPath responses lazily and memoize only successful builds.
• Retry endpoint/documentation initialization after construction defects instead of poisoning the runtime.

Benchmark

Five fresh-workerd request runs, median:

• GET /health: 202.3 ms → 125.6 ms (-37.9%).
• Unauthenticated GET /v2/services: 207.3 ms → 129.0 ms (-37.8%).
• Upload-time startup CPU is intentionally unchanged (114.2 ms → 117.8 ms, sampling noise); this layer moves route construction, not the static module graph.

Verification

• Vendored Effect HTTP API tests: 48 passed.
• API and domain typechecks passed in the complete stack.

Stack: 1/3. Followed by #594 and #595.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[github-actions]

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