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>

pyproject.toml

@@ -26,7 +26,7 @@ dependencies = [
     "requests>=2.31.0",
     "python-dotenv>=1.0.0",
     "pydantic>=2.0.0",
-    "fastmcp>=0.1.0",
+    "fastmcp>=2.13.0,<3.0.0",
 ]
 
 [project.optional-dependencies]
@@ -39,6 +39,7 @@ dev = [
     "mypy>=1.5.0",
     "pre-commit>=3.4.0",
     "types-requests>=2.31.0",
+    "vcrpy>=4.0.0",
 ]
 
 [build-system]