fix(language-service): use textEdit for version completion and fix empty range handling

[luo2430]

解决以下问题

问题一（空字符串时代码提示全是*）

问题二（vscode 默认的 word range 不包含 ^（非单词字符），导致 ^ 未被替换而是在前面又插入了一个 ^0.0.1）

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 7aee98a7-b459-4465-9e94-66a53dc6a0b7

📥 Commits

Reviewing files that changed from the base of the PR and between b14676c and b3ec29d.

📒 Files selected for processing (3)

• packages/language-service/src/plugins/version-completion.ts
• packages/language-service/src/utils/version.test.ts
• packages/language-service/src/utils/version.ts

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📝 Walkthrough

Walkthrough

getVersionRangePrefix is narrowed so that only the exact string '*' returns a wildcard prefix; empty strings no longer match. A corresponding test expectation for an empty rawSpec is updated from '*' to '2.0.0'. In the completion provider, each completion item is changed from using insertText to a textEdit that carries a range derived from dep.specRange and sets newText to the formatted version string.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description matches the code changes, covering empty-spec completion and the caret range replacement fix.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[9romise]

Thanks!