MarekWo 8e353407d3 feat(regions): add data layer for per-channel region scopes ...

Introduces the SQLite-backed region registry and channel->region mapping
that will drive the per-channel flood-scope feature. No UI or device
wiring yet; those land in subsequent PRs.

- schema.sql: new `regions` and `channel_scopes` tables + partial index
  on the default flag.
- database.py: CRUD helpers for regions (create/list/get/delete/default)
  and channel_scopes (set/get/bulk-load) with ON DELETE CASCADE.
- app/meshcore/regions.py: pure helpers for SHA256('#'+name)[:16] key
  derivation and firmware-compatible name validation (mirrors the
  `RegionMap::is_name_char` rule `c in {-,$,#} or c>='0' or c>='A'`).
- tests/test_regions.py: known SHA256 vectors, validator coverage
  (incl. the firmware quirk that `_` and other 0x5B-0x60 chars are
  admitted), and CRUD + cascade integration tests.

2026-04-24 07:12:55 +02:00

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