Integrate Social Mapping across the platform

[KingAkeem]

Summary

• adds Social Mapping as a pinned submodule and Compose service
• routes /map/* through nginx with readiness and durable cache storage
• extends dataset imports with paired coordinates, accuracy, source, and additive migration
• adds radius-filtered GeoJSON search with provenance and associated phone metadata
• pins the merged native whoisit Map workspace
• adds synthetic London, Arlington, and Portland data plus a credential-free end-to-end check
• updates platform and dataset documentation

Local verification

• 14 platform tests pass
• Compose YAML structure parses with all six services and both persistent volumes
• Python scripts compile and all three synthetic rows parse

Docker is not installed on the development machine, so hosted CI owns the full Compose build, configuration validation, and London end-to-end stack test.