Bump API to v3.0.0

[reuvenharrison]

Upgrade the Acme API from v2.1.0 to v3.0.0 with the following breaking changes:

• Endpoint removed: DELETE /users/{userId} — replaced by soft-delete via PATCH
• Parameter type changed: userId changed from string to integer for GET /users/{userId}
• Parameter became required: category query parameter is now required for GET /products

[oasdiff]

oasdiff API Change Report

🔴 3 breaking changes

Severity	Change	Path	Review
🔴	the query request parameter category became required	GET /products	✅ Approved by @reuvenharrison
🔴	for the path request parameter userId, the type/format was changed from string/`` to integer/`int64`	GET /users/{userId}	⏳ Review
🔴	api removed without deprecation	DELETE /users/{userId}	⏳ Review

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Compared at 86d7ca3 · 📋 Review & approve changes