[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.Tests/RouteCsvWriterTests.cs

@@ -0,0 +1,58 @@
+using FluentAssertions;
+using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Options;
+using SatelliteProvider.Common.Configs;
+using SatelliteProvider.Services.RouteManagement;
+
+namespace SatelliteProvider.Tests;
+
+// AZ-364 / C11: route-side CSV writer wraps the shared TileCsvWriter and
+// owns the route_<id>_ready.csv path. Only the wrapping behavior (path,
+// row mapping, returned path) is tested here; CSV byte format is the
+// shared TileCsvWriter's concern (covered separately).
+public class RouteCsvWriterTests : IDisposable
+{
+    private readonly string _tempDir;
+
+    public RouteCsvWriterTests()
+    {
+        _tempDir = Path.Combine(Path.GetTempPath(), "az364_routecsv_" + Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(_tempDir);
+    }
+
+    public void Dispose()
+    {
+        if (Directory.Exists(_tempDir))
+        {
+            Directory.Delete(_tempDir, recursive: true);
+        }
+        GC.SuppressFinalize(this);
+    }
+
+    [Fact]
+    public async Task WriteAsync_ProducesExpectedFileAndReturnsItsPath_AZ364_AC1()
+    {
+        // Arrange
+        var routeId = Guid.NewGuid();
+        var storageOptions = Options.Create(new StorageConfig { ReadyDirectory = _tempDir });
+        var sut = new RouteCsvWriter(storageOptions, NullLogger<RouteCsvWriter>.Instance);
+        var tiles = new List<TileInfo>
+        {
+            new(40.0, -73.0, "/tiles/a.jpg"),
+            new(41.0, -74.0, "/tiles/b.jpg"),
+        };
+
+        // Act
+        var path = await sut.WriteAsync(routeId, tiles);
+
+        // Assert
+        path.Should().Be(Path.Combine(_tempDir, $"route_{routeId}_ready.csv"));
+        File.Exists(path).Should().BeTrue();
+
+        var lines = await File.ReadAllLinesAsync(path);
+        lines.Should().HaveCount(3);
+        lines[0].Should().Be("latitude,longitude,file_path");
+        lines.Should().Contain("41.000000,-74.000000,/tiles/b.jpg");
+        lines.Should().Contain("40.000000,-73.000000,/tiles/a.jpg");
+    }
+}