[AZ-364] [AZ-360] Refactor C11+C08: decompose RouteProcessingService

Extracts RouteRegionMatcher, RouteCsvWriter, RouteSummaryWriter,
RouteImageRenderer, TilesZipBuilder, RegionFileCleaner from the
~750-LOC RouteProcessingService god-class. Moves TileInfo to its
own file as a sealed record. Replaces IServiceProvider scope-
locator with a direct IRegionService injection (folds AZ-360 / C08).
Updates DI registration and tests.

Tests: 133 / 133 unit + 5 / 5 smoke green; integration suite exit 0.
Pixel-equivalent stitched route image and byte-equivalent CSV /
summary / ZIP outputs verified through the smoke run.

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

SatelliteProvider.Services.RouteManagement/RouteCsvWriter.cs

@@ -0,0 +1,40 @@
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using SatelliteProvider.Common.Configs;
+using SatelliteProvider.Common.Utils;
+
+namespace SatelliteProvider.Services.RouteManagement;
+
+// AZ-364 / C11: extracted from RouteProcessingService.GenerateRouteCsvAsync.
+// Owns the route_<id>_ready.csv path computation and delegates the actual
+// rows-to-CSV serialization to the shared TileCsvWriter (Common). Returns
+// the produced file path so the orchestrator can persist it on the route.
+public class RouteCsvWriter
+{
+    private readonly StorageConfig _storageConfig;
+    private readonly ILogger<RouteCsvWriter> _logger;
+
+    public RouteCsvWriter(IOptions<StorageConfig> storageConfig, ILogger<RouteCsvWriter> logger)
+    {
+        ArgumentNullException.ThrowIfNull(storageConfig);
+        _storageConfig = storageConfig.Value;
+        _logger = logger;
+    }
+
+    public async Task<string> WriteAsync(
+        Guid routeId,
+        IEnumerable<TileInfo> tiles,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(tiles);
+
+        Directory.CreateDirectory(_storageConfig.ReadyDirectory);
+        var filePath = Path.Combine(_storageConfig.ReadyDirectory, $"route_{routeId}_ready.csv");
+
+        var rows = tiles.Select(t => new TileCsvRow(t.Latitude, t.Longitude, t.FilePath)).ToList();
+        await new TileCsvWriter().WriteAsync(filePath, rows, cancellationToken);
+
+        _logger.LogInformation("Route CSV generated: {FilePath} with {Count} tiles", filePath, rows.Count);
+        return filePath;
+    }
+}