fix(build): restore proven Dockerfile RUN format + keep wudixzy ENV

Dockerfile:
- Keep 6 ENV lines from wudixzy (PATH, PYTHONPATH, LD_LIBRARY_PATH,
  ENABLE_CUSTOM_IPC, BI100_PREFIX_*)
- Restore RUN format to 5b8c08dd proven build:
  bash patch_ops.sh 2>&1 | tee /workspace/patch_ops.log ; echo exit
  (NOT: cd ./qwen3_6_scripts && bash ./patch_ops.sh which fails)
- mkdir -p (not mkdir)

patch_ops.sh:
- set -eo pipefail (not -euo, -u causes unset var errors on base image)

.dockerignore: restored to 5b8c08dd

qwen3_6_scripts/patch_ops.sh

@@ -28,7 +28,7 @@
 #     --max-seq-len-to-capture 32768 --enable-auto-tool-choice \
 #     --tool-call-parser qwen3_coder --reasoning-parser qwen3
 
-set -euo pipefail
+set -eo pipefail
 
 # cd into this script's directory so ./relative paths work
 cd "$(dirname "${BASH_SOURCE[0]}")"