Fix: bin directory cannot be copied to docker image introduced by #13444 (#13502)

### What problem does this PR solve?

bin directory cannot be copied to docker image introduced by

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

.gitignore

@@ -229,4 +229,5 @@ internal/cpp/cmake-build-debug/
 .trae/
 
 # Go server build output
-bin/
+bin/*
+!bin/.gitkeep

Dockerfile

@@ -212,13 +212,7 @@ COPY pyproject.toml uv.lock ./
 COPY mcp mcp
 COPY common common
 COPY memory memory
-
-RUN if [ -d bin ]; then \
-        cp -r bin ./; \
-        echo "✓ bin copied"; \
-    else \
-        echo "✗ bin ignored"; \
-    fi
+COPY bin bin
 
 COPY docker/service_conf.yaml.template ./conf/service_conf.yaml.template
 COPY docker/entrypoint.sh ./