chore: use tsgo in development

[johnsoncodehk]

Changes:

• Use tsgo instead of tsc in build and watch scripts
• Enable typescript.experimental.useTsgo in VSCode settings (requires installing https://marketplace.visualstudio.com/items?itemName=TypeScriptTeam.native-preview)
• No longer use rolldown watch mode in development; VSCode debug now only runs tsgo -w

Issues:

• tsslint is no longer working in the IDE
• Since the workspace has lost Vue language support, debugging can only be run for testing now

[Copilot]

Pull request overview

This PR migrates the development build process from tsc (TypeScript Compiler) to tsgo (TypeScript's experimental native compiler), aiming to improve build performance during development. The changes include updating build scripts, reorganizing the VSCode extension source structure, and configuring the workspace to use the experimental tsgo compiler.

Key Changes

• Replaced tsc with tsgo in build and watch scripts across the workspace
• Reorganized VSCode extension sources from lib/ to src/ directory
• Updated all devDependencies to use "latest" versions instead of pinned versions

Reviewed changes

Copilot reviewed 14 out of 24 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
package.json	Updated build/watch scripts to use tsgo, changed all devDependencies to "latest", updated packageManager version
tsconfig.json	Added reference to extensions/vscode tsconfig
extensions/vscode/tsconfig.json	Changed from noEmit to outDir/rootDir, added project references
extensions/vscode/src/*	New source files moved/created from lib directory (welcome.ts, config.ts, etc.)
extensions/vscode/package.json	Simplified build scripts, changed devDependencies to "latest", updated gen-ext-meta path
extensions/vscode/main.js	New entry point that tries out/ directory first, falls back to dist/
extensions/vscode/rolldown.config.ts	Simplified config, removed development mode, always minifies output
.vscode/settings.json	Enabled typescript.experimental.useTsgo, removed vue.server.path and typescript.tsdk
.vscode/tasks.json	Simplified task definitions for build and watch
packages/language-server/lib/server.ts	Simplified getExistingLanguageServices to return synchronous array

Comments suppressed due to low confidence (1)

extensions/vscode/src/extension.ts:25

• The variable 'serverPath' is changed from 'const' to 'let' to allow reassignment later in the code. However, the reassignment happens inside a conditional block where a new value might not always be assigned. Consider initializing it with the result of resolveServerPath() or ensuring all code paths properly handle the case when it remains undefined.

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