Task 8: Standardize modeling style (TypedDict vs Pydantic)

Convert inconsistent modeling style to standardized Pydantic models for all
external-facing data structures while maintaining TypedDict compatibility where
appropriate for internal layer-private structures.

Changes:
- Converted IpLookupResult TypedDict to use IpLookupResponse Pydantic model
  in jail_service.lookup_ip() for consistency with routers
- Added GeoCacheEntry Pydantic model for geo cache repository rows
- Converted GeoCacheRow TypedDict to use GeoCacheEntry alias
- Converted ImportLogRow TypedDict to use ImportLogEntry alias
- Updated routers and services to work with Pydantic models
- Updated all tests to use Pydantic model field access (attributes)
  instead of dict subscripting

Documentation:
- Added 'Model Type Usage by Layer' section to Backend-Development.md
- Defines when TypedDict is allowed (internal structures) vs Pydantic
  (external-facing, cross-boundary data)
- Provides clear guidance on modeling conventions per layer

Benefits:
- Consistent validation and serialization behavior
- Better IDE support and type checking
- Clearer separation of concerns by layer
- Reduced maintenance cost from mixed validation approaches

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Docs/Tasks.md

@@ -1,22 +1,3 @@
-## 7) Service layer coupled to response/presentation models
-- Where found:
-	- [backend/app/services/ban_service.py](backend/app/services/ban_service.py)
-- Why this is needed:
-	- Domain logic becomes tied to API shape and slows model evolution.
-- Goal:
-	- Keep service returns domain-centered; map to API models at router boundary.
-- What to do:
-	- Introduce service DTO/domain objects.
-	- Map to response models in routers or dedicated mappers.
-- Possible traps and issues:
-	- Temporary duplicate model definitions during migration.
-- Docs changes needed:
-	- Add layer responsibilities and mapping policy.
-- Doc references:
-	- [Docs/Architekture.md](Docs/Architekture.md)
-
----
-
 ## 8) Inconsistent modeling style (TypedDict vs Pydantic)
 - Where found:
 	- [backend/app/services/jail_service.py](backend/app/services/jail_service.py)