Fix web Dockerfile to copy templates directory

Fixed TemplateNotFound error by adding missing templates directory
to the Docker image.

Error:
  jinja2.exceptions.TemplateNotFound: index.html

Cause:
  Dockerfile was not copying the templates/ directory into the container

Fix:
  Added 'COPY templates/ ./templates/' to Dockerfile

The web application requires templates/ directory for Jinja2 templates:
- templates/base.html
- templates/index.html
- templates/items.html
- templates/users.html
- templates/llm.html

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

web/Dockerfile

@@ -10,8 +10,9 @@ RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy application and documentation
 COPY main.py .
-COPY docs/ ./docs/
+COPY templates/ ./templates/
 COPY static/ ./static/
+COPY docs/ ./docs/
 COPY mkdocs.yml .
 
 # Build documentation during image build