Add architecture foundation modules

[Dadud]

Summary

This PR starts the larger Scanner Map modernization effort with a reviewable foundation slice:

• adds shared config parsing, validation, and redaction helpers
• adds database migration planning and an applyMigrations helper
• adds ingestion normalization helpers for SDRTrunk, TrunkRecorder, and rdio-compatible uploads
• adds role/permission primitives for future RBAC work
• adds sample demo calls and a demo data generator
• adds Node smoke tests and CI
• documents the modernization roadmap across queueing, demo mode, frontend modules, data retention, roles, and adapters

Why

The larger goals include modularization, job queues, demo mode, central config validation, tests, frontend decomposition, data model improvements, roles, and upload adapters. This PR intentionally avoids rewriting the live runtime path all at once. It creates tested modules and a roadmap that future PRs can migrate into safely.

Verification

• npm test
• npm run check:syntax
• npm run check:config
• npm run demo:data

Notes

This is stacked on top of the contributor setup PR because it uses the package scripts and test setup added there.