test: fix validation order and circuit breaker expectations
Update integration tests to reflect new validation order and circuit
breaker integration in unfurl service.
Changes in post_creation_test.go:
- Fix content length validation test expectations
- Update validation order: basic input before DID authentication
- Adjust test assertions to match new error flow
Changes in post_unfurl_test.go:
- Update Kagi provider test to expect circuit breaker wrapper
- Fix provider name expectations in unfurl tests
- Ensure tests align with circuit breaker integration
These changes ensure all integration tests pass with the new validation
flow and circuit breaker implementation.
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Co-Authored-By: Claude <noreply@anthropic.com>