fix(chore): replace unpkg with npmmirror

[chilingling]

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PR

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• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Background and solution

What is the current behavior?

local development using importmap
本地开发环境使用 importmap，unpkg 被墙时会导致不可用

Issue Number: N/A

What is the new behavior?

local development not using importmap, change to local node_modules
本地开发环境使用 node_modules，避免本地开发环境不可用

Does this PR introduce a breaking change?

• Yes
• No

Other information