v0.6.1: packaging fix (missing adapter files), pypi readme/description update, ontology docs fixes

v0.6.1: packaging fix (fix missing adapter files), pypi README/description improvements, ontology docs path corrections

1. flexible-graphrag/pyproject.toml — bump to 0.6.1; add adapters* to
   packages.find include (fixes ModuleNotFoundError: No module named
   'adapters' after PyPI install); rewrite description to be keyword-rich

2. flexible-graphrag/README.md — canonical intro paragraph; quick-install
   code block; LlamaIndex-only caveat with Framework Config doc link;
   corrected ontology schema paths (../schemas/); pointer to full README
   for Docker/frontend/extras

3. flexible-graphrag/start.py — fix docstring: uv run python -m start
   replaced with python -m start (former only works from source checkout)

4. flexible-graphrag-mcp/pyproject.toml — bump to 0.6.1; rewrite
   description (replace "HTTP bridge" with "connects to", add DB/source counts)

5. flexible-graphrag-mcp/README.md — top paragraph replaced with
   canonical project intro; remove "HTTP bridge" and GET /api/status
   references

6. docs/DATABASES/RDF/ontology_examples_and_config.md — clarify
   ontologies apply to both property graphs and RDF stores (not RDF-only);
   remove misleading RDF_GRAPH_DB block; correct all schema paths to
   ../schemas/ (matching env-sample.txt); add install-type note

7. CHANGELOG.md — 0.6.1 entry