Refactor to use FastMCP mixin pattern for composable tools: - PLSSMixin: Section/Township/Range queries - SurfaceManagementMixin: Land manager (BLM, USFS, NPS, Private, etc.) - MiningClaimsMixin: Active/closed mining claims from MLRS Shared BLM API client handles identify/query operations against multiple ArcGIS REST endpoints.
Query Section/Township/Range from lat/long coordinates using the BLM National Cadastral ArcGIS REST service. Tools: - get_plss_location: human-readable PLSS description - get_plss_details: structured data with full metadata
