Fix package structure in Docker: copy into undertrial_ai/ subdir for correct import

Dockerfile

@@ -5,21 +5,27 @@ RUN useradd -m -u 1000 user
 USER user
 ENV PATH="/home/user/.local/bin:$PATH"
 
-WORKDIR /app
+# /workspace is the pip build root
+# /workspace/undertrial_ai is the actual Python package
+WORKDIR /workspace
 
 # Install server dependencies first (layer caching)
 COPY --chown=user server/requirements.txt requirements.txt
 RUN pip install --no-cache-dir --upgrade -r requirements.txt
 
-# Copy full package source
-COPY --chown=user . /app
+# Copy pyproject.toml to workspace root (pip needs it here)
+COPY --chown=user pyproject.toml pyproject.toml
 
-# Install the undertrial_ai package (regular install, not editable — works in Docker)
-RUN pip install --no-cache-dir --upgrade .
+# Copy entire project into undertrial_ai/ subdirectory
+# This creates: /workspace/undertrial_ai/__init__.py etc.
+# which is the correct importable structure
+COPY --chown=user . /workspace/undertrial_ai/
 
+# pip install from /workspace — setuptools finds undertrial_ai/ package dir
+RUN pip install --no-cache-dir --upgrade .
 
-# Episode data directory (falls back to built-in demo episodes if empty)
-ENV UNDERTRIAL_EPISODES_DIR=/app/data/episodes
+# Episode data directory (built-in demo episodes used as fallback)
+ENV UNDERTRIAL_EPISODES_DIR=/workspace/undertrial_ai/data/episodes
 
 # HuggingFace Spaces requires port 7860
 EXPOSE 7860