Update feature-fetch and openapi-ts-router examples

[bennobuilder]

Changes

Updates the examples for using generated paths with builder.group libraries:

• feature-fetch for OpenAPI-typed client calls with explicit success/error branches
• openapi-ts-router for Hono and Express routes checked against generated OpenAPI types
• Updates the benchmark setup to use feature-fetch@0.1.0 and its baseUrl option
• Fixes the openapi-fetch benchmark link

How to Review

Review the updated docs examples for accuracy, clarity, and tone.

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

[netlify]

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Latest commit: 0c94b1e

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