CONV-299: Add API rate limiting baseline

[menvil]

Summary

• Registers api-v1 rate limiter in AppServiceProvider using FeatureAccessService::limit($user, 'api_rate_limit_per_minute') (defaults to 60 for authenticated, 30 for unauthenticated)
• Protected API route group now includes throttle:api-v1
• Smoke test confirms the limiter is registered

Test plan

• RateLimiter::limiter('api-v1') is not null
• composer test passes (551 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds api-v1 rate limiting to v1 API routes to prevent spikes and enforce plan-based limits. Implements the baseline defined in CONV-299.

• New Features
  • Registers api-v1 limiter in AppServiceProvider using FeatureAccessService::limit(...).
  • Defaults: 60/min for authenticated, 30/min for unauthenticated; keyed by user ID or IP via RateLimiter.
  • Applies throttle:api-v1 to the protected API route group.
  • Adds tests to confirm limiter registration and expected 200/429 behavior.

^{Written for commit b0c2534. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-299-add-api-rate-limiting-baseline

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