Bump base image to Node 22 and reduce image size

[nvdk]

Switches the base image from node:20-bookworm to node:22-bookworm-slim, reducing the image size from ~452 MB to ~168 MB (~3× smaller).

Tested:

• Production build runs correctly
• Development mode live reload works correctly (file changes trigger recompile and clean restart without port conflicts)
• chrome debugger connected correctly

Notes:

• replaced ps -p check with equivalent kill -0 check (ps is not available in slim image)
• installs ca-certificates and wget explicitly since those were missing from the slim image

[nvdk]

Note: I think we should also bump typescript to 5.x but I kept it out of this PR for simplicity

[erikap]

We definitely need to test the integration with the Node inspector, as that's why we switched from alpine version to bookworm in the past. See commit aa69f40

[nvdk]

We definitely need to test the integration with the Node inspector, as that's why we switched from alpine version to bookworm in the past. See commit aa69f40

Yes I was aware :). This is why I kept bookworm, but switched to bookworm-slim. In my testing the node inspector now works correctly, but extra testing is always welcome 👍