Add bilingual (Chinese/English) comments to SectionKit codebase

[Copilot]

This PR adds comprehensive bilingual documentation comments to the core SectionKit framework files located in the /Sources directory. The comments provide clear explanations in both Chinese and English to improve code readability and help developers understand the framework's architecture.

Changes Made

Added bilingual comments to 18+ key files covering:

Core Framework

• SectionKit.swift: Main framework class with singleton pattern and compatibility wrapper
• SKBinding.swift: Property wrapper for bidirectional data binding with Combine integration
• SKCManager.swift: Collection view manager handling data source and delegate operations

Protocols & Architecture

• SKCSectionProtocol.swift: Core section protocol definitions and type aliases
• SKCAnySectionProtocol.swift: Type-erased section abstraction protocol
• SKConfigurableModelProtocol.swift: Model configuration protocol definitions
• SKSupplementaryKind.swift: Supplementary view type enumeration

Utility Classes

• SKIDBox.swift: Generic ID wrapper for value types with unique identification
• SKWeakBox.swift: Weak reference container with dynamic member lookup
• SKInout.swift: Chainable object configuration utility
• SKPublished.swift: Enhanced publisher functionality with weak reference support
• SKPrint.swift: Conditional debug logging utility

UI Components

• SKUIController.swift: SwiftUI-UIKit view controller bridge
• SKUIView.swift: SwiftUI-UIKit view bridge
• SKBindingKey.swift: Value binding with closure support for UI components

Performance & Advanced Features

• SKKVCache.swift: High-performance key-value cache with expiration support
• SKHighPerformanceStore.swift: Size calculation caching for performance optimization
• SectionArrayResultBuilder.swift: Result builder for declarative array construction

Comment Style

All comments follow a consistent bilingual format:

/// 中文描述
/// English description
public class ExampleClass {
    /// 属性的中文描述
    /// English description of property
    public var property: Type
}

The comments provide:

• Clear explanations of class/struct purposes
• Parameter and return value descriptions
• Usage examples where helpful
• Architecture and design pattern explanations

This enhancement makes the SectionKit framework more accessible to both Chinese and international developers, improving maintainability and adoption.

Fixes #7.

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