Align test coverage targets in README with development plan

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

README.md

@@ -148,7 +148,7 @@ Want to contribute or see what's coming next?
 - 🔐 Production-grade permission system (Object/Field/Record-level)
 - 🪝 Complete lifecycle hooks system
 - 🔗 Full relationship support (Lookup, Master-Detail, Many-to-Many)
-- 🧪 80%+ test coverage
+- 🧪 Test coverage (90% Kernel, 80% Server, 70% UI)
 
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