[AZ-284] Autodev baseline + testability refactor

Phase A baseline outputs from /autodev (Steps 1-5):
- Problem & solution docs (_docs/00_problem, _docs/01_solution)
- Codebase documentation (_docs/02_document) incl. architecture,
  module-layout, glossary, system-flows, baseline compliance scan
- Test specs (blackbox, performance, resilience, security, resource,
  traceability matrix)
- Test task decomposition (_docs/02_tasks/todo): AZ-285..AZ-290
- Testability refactor (_docs/04_refactoring/01-testability-refactoring):
  - TC-01 Move DownloadedTileInfoV2 + new ExistingTileInfo to Common.DTO
  - TC-02 Replace dead ISatelliteDownloader API with real signatures
  - TC-03 GoogleMapsDownloaderV2 implements ISatelliteDownloader
  - TC-04 TileService depends on ISatelliteDownloader (mockable)
  - TC-05 DI + endpoints use ISatelliteDownloader
- Test runner scripts (scripts/run-tests.sh, run-performance-tests.sh)
- Autodev state pointer (_docs/_autodev_state.md)

Prepares the codebase for AZ-285..AZ-290 unit/integration test work.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/02_document/modules/dataaccess_models.md

@@ -0,0 +1,66 @@
+# Module: DataAccess/Models
+
+## Purpose
+Database entity classes that map directly to PostgreSQL tables via Dapper. Property names use PascalCase; column mapping is done with SQL aliases in repository queries.
+
+## Public Interface
+
+### TileEntity
+Maps to `tiles` table.
+- `Id` (Guid), `TileZoom` (int), `TileX` (int), `TileY` (int)
+- `Latitude`, `Longitude` (double), `TileSizeMeters` (double), `TileSizePixels` (int)
+- `ImageType` (string), `MapsVersion` (string?), `Version` (int)
+- `FilePath` (string), `CreatedAt`, `UpdatedAt` (DateTime)
+
+### RegionEntity
+Maps to `regions` table.
+- `Id` (Guid), `Latitude`, `Longitude` (double), `SizeMeters` (double)
+- `ZoomLevel` (int), `Status` (string: "queued"/"processing"/"completed"/"failed")
+- `CsvFilePath`, `SummaryFilePath` (string?)
+- `TilesDownloaded`, `TilesReused` (int), `StitchTiles` (bool)
+- `CreatedAt`, `UpdatedAt` (DateTime)
+
+### RouteEntity
+Maps to `routes` table.
+- `Id` (Guid), `Name` (string), `Description` (string?)
+- `RegionSizeMeters` (double), `ZoomLevel` (int)
+- `TotalDistanceMeters` (double), `TotalPoints` (int)
+- `RequestMaps`, `MapsReady`, `CreateTilesZip` (bool)
+- `CsvFilePath`, `SummaryFilePath`, `StitchedImagePath`, `TilesZipPath` (string?)
+- `CreatedAt`, `UpdatedAt` (DateTime)
+
+### RoutePointEntity
+Maps to `route_points` table.
+- `Id` (Guid), `RouteId` (Guid), `SequenceNumber` (int)
+- `Latitude`, `Longitude` (double), `PointType` (string)
+- `SegmentIndex` (int), `DistanceFromPrevious` (double?)
+- `CreatedAt` (DateTime)
+
+## Internal Logic
+Plain POCOs with no logic.
+
+## Dependencies
+None.
+
+## Consumers
+- All repository implementations (TileRepository, RegionRepository, RouteRepository)
+- `TileService` — creates `TileEntity` instances for persistence
+- `RegionService` — creates/updates `RegionEntity`
+- `RouteService` — creates `RouteEntity` and `RoutePointEntity`
+- `RouteProcessingService` — reads entities from repositories
+- `GoogleMapsDownloaderV2.GetTilesWithMetadataAsync` — accepts `IEnumerable<TileEntity>` to check existing tiles
+
+## Data Models
+These ARE the data model.
+
+## Configuration
+None.
+
+## External Integrations
+None.
+
+## Security
+None.
+
+## Tests
+No dedicated tests.