fix(update): install LS via install-ls sources

[andya1lan]

改了什么 / What changed

• Route update.sh language-server updates through install-ls.sh instead of a stale hardcoded WindsurfAPI release URL.
• Align install/update copy with the current fallback chain: WindsurfAPI release → Windsurf desktop LS release → Exafunction fallback.
• Add regression coverage for the release-source fallback and macOS-compatible .env parsing.

为什么 / Why

update.sh still downloaded language_server_linux_x64 from the old dwgx/WindsurfAPI release asset directly, while install-ls.sh had already been updated to use the fresh third-party Windsurf desktop LS release fallback. This made one-click updates miss the newer LS source and bypass the atomic install path.

The .env parser in update.sh also used GNU-only grep -P, which fails on macOS BSD grep during local debugging.

测试 / Testing

• bash -n update.sh install-ls.sh
• node --test test/update-script-ls-source.test.js test/install-ls-atomic-rename.test.js test/platform-ls-paths.test.js test/langserver-binary-update.test.js test/check-i18n.test.js

Checklist

• 代码风格和现有文件一致 / Code style matches existing files
• 没有引入 npm 依赖 / No new npm dependencies (project is zero-dep)
• 涉及 LS binary 协议改动时 在 PR 描述里注明字段号来源 / If touching LS protocol, document field-number source in the PR description (N/A: no LS protocol fields changed)
• 涉及 dashboard UI 用 App.confirm / App.prompt 不用浏览器原生 alert/confirm / Uses App.confirm / App.prompt, not native dialogs (if dashboard) (N/A: copy only, no dashboard dialog flow changed)

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the update.sh language-server (LS) update mechanism to delegate downloads/selection logic to install-ls.sh, and adds guards/tests/documentation to prevent drifting back to a stale hardcoded LS release URL.

Changes:

• Replace update.sh’s hardcoded LS download logic with a call to install-ls.sh (using LS_INSTALL_PATH).
• Swap GNU grep -P parsing of .env for an awk-based approach for better macOS compatibility.
• Add a Node test to enforce delegation and avoid reintroducing the stale WindsurfAPI asset URL; update UI strings and docs to reflect new fallback sources.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
update.sh	Delegates LS updates to install-ls.sh and replaces .env parsing implementation
test/update-script-ls-source.test.js	Adds regression tests to prevent hardcoded LS URL / GNU grep-only usage
src/dashboard/i18n/zh-CN.json	Updates LS update description text to reflect additional sources
src/dashboard/i18n/en.json	Updates LS update description text to reflect additional sources
src/dashboard/api.js	Updates inline comment describing LS source fallback chain
install-ls.sh	Updates usage/docs and clarifies fallback chain comment
README.md	Documents that update.sh now updates LS via install-ls.sh
README.en.md	Documents that update.sh now updates LS via install-ls.sh

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[andya1lan]

Fixed problems raised by copilot.