Modernize to pyproject.toml and fix test assertion

- Remove requirements.txt and requirements-dev.txt (duplicates pyproject.toml)
- Update Dockerfile to use 'pip install .' instead of requirements.txt
- Update README.md and GitHub workflows to use 'pip install -e .[dev]'
- Fix test_get_valuation_comparables: check for 'deal_date' instead of non-existent 'asset_room_num'
  (rooms field is optional and excluded when None due to exclude_none=True)
- Fix fastmcp version constraint in pyproject.toml (>=2.13.0,<3.0.0)
- Add vcrpy to dev dependencies

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

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

Dockerfile

@@ -18,16 +18,16 @@ RUN apt-get update && \
     gcc \
     && rm -rf /var/lib/apt/lists/*
 
-# Copy requirements first for better layer caching
-COPY requirements.txt .
+# Copy package files for better layer caching
+COPY pyproject.toml .
+COPY README.md .
 
 # Install Python dependencies
-RUN pip install --no-cache-dir -r requirements.txt
+RUN pip install --no-cache-dir .
 
 # Copy application code
 COPY nadlan_mcp/ ./nadlan_mcp/
 COPY run_http_server.py .
-COPY README.md .
 
 # Create non-root user for security
 RUN useradd -m -u 1000 appuser && \