feat(disease): implement MONDO and Open Targets adapters, MCP tools, and CLI (v0.6.0)

[engkinandatama]

Description

Implements Phase 1.5 Minor Release v0.6.0 focusing on Disease Ontology and Therapeutic Target Grounding as specified in the BioContext Roadmap.

Key Changes

1. MONDO Disease Ontology Adapter (MondoAdapter):
   • Primary authority for disease identification via EBI OLS4 API.
   • Resolves canonical MONDO:xxxxxxx identifiers, preferred labels, clinical definitions, synonyms, and cross-references (OMIM, Orphanet, DOID, UMLS).
   • Free-text fuzzy search against MONDO term synonyms.
2. Open Targets Platform Adapter (OpenTargetsAdapter):
   • Querying Open Targets GraphQL API (api.platform.opentargets.org/api/v4/graphql).
   • Retrieves evidence-backed target-disease associations with aggregate confidence scores (0.0 - 1.0) and datatype evidence breakdown (genetic, somatic, literature, animal).
3. FastMCP Server Expansion (10 Production Tools):
   • Added resolve_disease(query, limit) tool for clinical disease normalization.
   • Added get_target_diseases(gene, limit) tool for therapeutic target-disease mapping.
4. CLI Subcommands:
   • biocontext disease <query>
   • biocontext targets <gene>
5. Testing & QA:
   • Added tests/test_disease_adapter.py with 7 dedicated unit and MCP integration tests (all passing).
   • Version bumped to 0.6.0 in pyproject.toml.