feat: add freezeRuntime option to prevent runtime modifications

[ClarkXia]

This pull request introduces a new "freeze runtime" feature to the icestark package, which allows runtime libraries (like React) to be locked to a specific version and prevents them from being accidentally overwritten. The change is integrated into the configuration, asset handling utilities, and is thoroughly tested.

[wisdomofgod]

邮件已收到~~

[Copilot]

Pull Request Overview

This PR introduces a new freezeRuntime configuration option to the icestark package that prevents runtime libraries from being accidentally overwritten after their initial assignment. When enabled, versioned runtime libraries (e.g., React@17.0.0) are locked using JavaScript property descriptors to prevent modifications.

• Adds freezeRuntime boolean option to global configuration with default value of false
• Implements runtime library freezing mechanism using Object.defineProperty with getter/setter logic
• Integrates the freeze functionality into the asset handling pipeline for runtime libraries

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
packages/icestark/src/util/globalConfiguration.ts	Adds freezeRuntime configuration option with documentation
packages/icestark/src/AppRouter.tsx	Passes freezeRuntime prop through to the start configuration
packages/icestark/src/util/handleAssets.ts	Implements generateRuntimeLockCode function and integrates freeze logic
packages/icestark/tests/handleAssets.spec.tsx	Adds comprehensive test coverage for the freezeRuntime functionality
CHANGELOG.md	Documents the new feature in version 2.8.5

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