refactor: move runtime parsers into scripts/docker

- serve_runtime.py and train_runtime.py are host-side Docker helpers, so they join train-entrypoint.sh and lib/ under scripts/docker/
- scripts/tools/ now contains only in-container CLIs
- update wrapper call sites, test import, and docker guide references

docs/developer/docker-serving.md

@@ -17,7 +17,7 @@ scripts/serve.sh             preflight, Compose wrapper, lifecycle
         └── server.py --config /run/astrai/serve.yaml
 ```
 
-`scripts/tools/serve_runtime.py` reads `runtime:` plus the two container-side
+`scripts/docker/serve_runtime.py` reads `runtime:` plus the two container-side
 values Compose needs (`server.port` for the port mapping, `server.device` for
 the preflight GPU check). `scripts/tools/server.py --config` reads `server:`.
 Explicit CLI arguments to `server.py` override `server:` YAML values.

docs/developer/docker-training.md

@@ -18,7 +18,7 @@ scripts/train.sh             preflight, Compose wrapper, lifecycle, timer
               └── train.py --config /run/astrai/train.yaml
 ```
 
-The two parsers deliberately own different sections. `scripts/tools/train_runtime.py`
+The two parsers deliberately own different sections. `scripts/docker/train_runtime.py`
 reads only `runtime`; `scripts/tools/train.py` reads only
 `model/data/parallel/training/ckpt/log`. Explicit trainer arguments after `--`
 override training YAML values.