docs: fix stale docs and align with code

- update cuda_kernels layout, arch flags, and add FP8 section
- fix install docs: kernels auto-build when nvcc + CUDA detected
- mark ignored OpenAI request params and complete KVCache fields
- add docker docs to indexes and astrai.optim to module overview
- refresh document update timestamps

docs/developer/docker-serving.md

@@ -106,3 +106,5 @@ working with defaults (port 8000, `./params`).
    `8000`); change `runtime.port` to publish on a different host port.
 5. The image user is built with the host UID/GID so the mounted model
    directory stays readable.
+
+> Document Update Time: 2026-08-22