Improve Documentation: Educational Patterns for Proxy-Based Abstractions

[mingxwa]

We're looking to expand Proxy's documentation to better support educational use cases and practical design patterns. While the current spec-focused docs serve advanced users well, we'd like to complement them with approachable examples that show how Proxy can be used to model abstraction in real-world scenarios.

[Nugine]

Two cases that may be useful:

• Serialization Framework
• Thread Pool Executor

[MoFHeka]

Replace "template <'typename T'>" to enhance the maintainability of the code, but ensure the same performance.