Convert BFF to TypeScript

[andreaskienle]

This PR makes the following changes:

• Migrated the BFF from JavaScript to TypeScript – only changed file extensions without adding types to keep it simple for now (TS errors are suppressed with @ts-ignore)
• Added a build step to emit JavaScript files (⁠npm run build:server)
• Changed the Dockerfile to use the slim node image, copy only the necessary files and remove dev dependencies after building
• Upgraded node from 22 to 24 (latest LTS)

[Copilot]

Pull Request Overview

This PR converts the Backend for Frontend (BFF) server from JavaScript to TypeScript to improve type safety and development experience. The migration involves adding TypeScript configuration, updating file extensions, and temporarily using @ts-ignore comments to suppress type errors during the transition.

Key changes include:

• Added TypeScript configuration and build tooling
• Converted all server-side JavaScript files to TypeScript (.ts extension)
• Updated build scripts and Docker configuration for TypeScript compilation
• Added temporary @ts-ignore comments to handle type issues during migration

Reviewed Changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tsconfig.server.json	New TypeScript configuration for server-side compilation
server/routes/*.ts	Route handlers converted to TypeScript with temporary type suppressions
server/plugins/*.ts	Plugin files converted to TypeScript with type suppressions
server/*.ts	Core server files converted to TypeScript
package.json	Updated Node.js version and added TypeScript build scripts
Dockerfile	Updated to use Node.js 24 and build TypeScript files
README.md	Updated file references to reflect .ts extensions

Comments suppressed due to low confidence (2)

package.json:6

• Node.js version 24 does not exist. The latest stable version is Node.js 22. Consider using "^22.0.0" instead.

    "node": "^24.0.0",

Dockerfile:21

• The distroless image for Node.js 24 does not exist. Use 'gcr.io/distroless/nodejs22-debian12' which corresponds to the actual Node.js version.

FROM gcr.io/distroless/nodejs24-debian12 AS production