fix: Remove setup_database.sql from Dockerfile

Database schema is managed externally - the SQL file was only copied
but never used by the application.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -13,7 +13,6 @@ RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy application
 COPY src/ ./src/
-COPY setup_database.sql .
 COPY pyproject.toml .
 
 # Configure git