[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>

SatelliteProvider.Services/TileService.cs

@@ -8,12 +8,12 @@ namespace SatelliteProvider.Services;
 
 public class TileService : ITileService
 {
-    private readonly GoogleMapsDownloaderV2 _downloader;
+    private readonly ISatelliteDownloader _downloader;
     private readonly ITileRepository _tileRepository;
     private readonly ILogger<TileService> _logger;
 
     public TileService(
-        GoogleMapsDownloaderV2 downloader,
+        ISatelliteDownloader downloader,
         ITileRepository tileRepository,
         ILogger<TileService> logger)
     {
@@ -36,11 +36,15 @@ public class TileService : ITileService
         
         var centerPoint = new GeoPoint(latitude, longitude);
         
+        var existingTileInfos = existingTilesList
+            .Select(t => new ExistingTileInfo(t.Latitude, t.Longitude, t.TileZoom))
+            .ToList();
+        
         var downloadedTiles = await _downloader.GetTilesWithMetadataAsync(
             centerPoint, 
             sizeMeters / 2, 
             zoomLevel, 
-            existingTilesList,
+            existingTileInfos,
             cancellationToken);
         
         var result = new List<TileMetadata>();