Add comprehensive security tests for TabSync and Phase 5 security features

- Implement Phase 5 security tests covering deserialization DoS, clock skew, concurrent updates, cross-session keys, filter bypass, replay attacks, and session hijacking.
- Introduce TabSync security tests focusing on clock skew tolerance, message size limits, state validation, and signature verification.
- Validate security configurations and ensure proper handling of sensitive data.

Author: mashrulhaque

README.md

@@ -1025,9 +1025,6 @@ public override Task OnAfterUpdateAsync(AppState previousState, AppState newStat
 ## Documentation
 
 - [Full Documentation](https://mashrulhaque.github.io/EasyAppDev.Blazor.Store/)
-- [Architecture Guide](./docs/ARCHITECTURE.md)
-- [Coding Standards](./docs/CODING_STANDARDS.md)
-- [Testing Strategy](./docs/TESTING_STRATEGY.md)
 
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