fix(docker): strip Windows CRLF from entrypoint.sh

.gitattributes

@@ -0,0 +1,2 @@
+# Ensure shell scripts always use LF line endings (Docker/Linux compat)
+*.sh text eol=lf

Dockerfile

@@ -38,7 +38,7 @@ RUN useradd -m -u 1000 -s /bin/bash nanobot && \
     chown -R nanobot:nanobot /home/nanobot /app
 
 COPY entrypoint.sh /usr/local/bin/entrypoint.sh
-RUN chmod +x /usr/local/bin/entrypoint.sh
+RUN sed -i 's/\r$//' /usr/local/bin/entrypoint.sh && chmod +x /usr/local/bin/entrypoint.sh
 
 USER nanobot
 ENV HOME=/home/nanobot