feat: add Avalonia Zafiro development, layout, and viewmodel skills

skills/avalonia-zafiro-development/naming-standards.md

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+# Naming & Coding Standards
+
+## General Standards
+
+- **Explicit Names**: Favor clarity over cleverness.
+- **Async Suffix**: Do **NOT** use the `Async` suffix in method names, even if they return `Task`.
+- **Private Fields**: Do **NOT** use the `_` prefix for private fields.
+- **Static State**: Avoid static state unless explicitly justified and documented.
+- **Method Design**: Keep methods small, expressive, and with low cyclomatic complexity.
+
+## Error Handling
+
+- **Result & Maybe**: Use types from **CSharpFunctionalExtensions** for flow control and error handling.
+- **Exceptions**: Reserved strictly for truly exceptional, unrecoverable situations.
+- **Boundaries**: Never allow exceptions to leak across architectural boundaries.