As a sales rep or analyst
I want customers and locations enriched with reusable region text coming from geocoding and reverse-geocoding results
So that Deep Research can compare the right local peer groups without heavy master-data maintenance.
Acceptance Criteria
- `Customer` and `Location` expose an `AdministrativeRegion` text field alongside `Country`, `State`, and `City`.
- The field is intended for values such as states, provinces, departments, and regions (for example `Bayern`, `Texas`, `Antioquia`).
- The design remains easy to populate directly from reverse-geocoding results without foreign-key lookup complexity.
- Existing access-control rules for transactional data remain unchanged.
- Any indexing/search optimization remains implementation-owned and transparent to users.
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