Comprehensive Unit Tests for FilterChainImpl after implemented TerminalHandler

[codebyNorthsteep]

Summary

This PR introduces unit tests for the FilterChainImpl class. The goal is to ensure that our server’s "Chain of Responsibility" architecture moving from security filters to the final response is robust and reliable.

Why

• Guaranteed Order: Ensures that critical checks, like authentication or logging, always happen before we touch the file system.
• Request Lifecycle Control: Proves that each filter has the authority to either pass the "baton" to the next step or drop it entirely to protect the server.

Testing approach

We mock the Filter and TerminalHandler interfaces to simulate various request scenarios without needing to launch a full network server.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch test/filterchain-terminalhandler

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