fix: remove non-existent data scripts from Dockerfile

The get_daily_price.py, get_interdaily_price.py, and merge_jsonl.py
scripts don't exist in the repository. Removed the RUN command that
tries to copy these files to /app/scripts/.

This fixes the Docker build failure:
ERROR: process did not complete successfully: exit code: 1

The API server doesn't need these data preparation scripts as it
operates on existing database records.

Dockerfile

@@ -26,12 +26,6 @@ WORKDIR /app
 # Copy application code
 COPY . .
 
-# Copy data scripts to separate directory (volume mount won't overlay these)
-RUN mkdir -p /app/scripts && \
-    cp data/get_daily_price.py /app/scripts/ && \
-    cp data/get_interdaily_price.py /app/scripts/ && \
-    cp data/merge_jsonl.py /app/scripts/
-
 # Create necessary directories
 RUN mkdir -p data logs data/agent_data