refactor: migrate new workspaces to TypeScript

[PierreDemailly]

No description provided.

[Copilot]

Pull Request Overview

This PR migrates the workspaces server and cache modules from JavaScript to TypeScript, adding comprehensive type annotations and updating build/test configurations.

• Introduces new tsconfig files and updates package.json scripts for TypeScript builds.
• Adds explicit TypeScript annotations across endpoints, middlewares, web socket commands, and tests.
• Enhances type safety by replacing implicit types and adding non-null assertions where needed.

Reviewed Changes

Copilot reviewed 38 out of 41 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
workspaces/server/tsconfig.json	New TypeScript configuration for the server module
workspaces/server/test/*	Test files updated with explicit type annotations
workspaces/server/src/*	Source files updated to include TypeScript types and non-null assertions
workspaces/cache/*	Cache module modified to use TypeScript and improved type safety
package.json, tsconfig.base.json, eslint.config.mjs	Build/test and linter configurations updated for TypeScript

Comments suppressed due to low confidence (1)

workspaces/server/src/websocket/index.ts:29

• [nitpick] Consider renaming 'WebSocketServerInstanciator' to 'WebSocketServerInstantiator' to use conventional spelling.

export class WebSocketServerInstanciator {