refactor: abstract IWebHostEnvironment to IReceiptStorageOptions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

MoneyMap.Core/Services/IReceiptStorageOptions.cs

@@ -0,0 +1,6 @@
+namespace MoneyMap.Services;
+
+public interface IReceiptStorageOptions
+{
+    string ReceiptsBasePath { get; }
+}

MoneyMap.Core/Services/ReceiptManager.cs

@@ -21,8 +21,7 @@ namespace MoneyMap.Services
     public class ReceiptManager : IReceiptManager
     {
         private readonly MoneyMapContext _db;
-        private readonly IWebHostEnvironment _environment;
-        private readonly IConfiguration _configuration;
+        private readonly IReceiptStorageOptions _receiptStorage;
         private readonly IServiceProvider _serviceProvider;
         private readonly IReceiptParseQueue _parseQueue;
         private readonly ILogger<ReceiptManager> _logger;
@@ -46,15 +45,13 @@ namespace MoneyMap.Services
 
         public ReceiptManager(
             MoneyMapContext db,
-            IWebHostEnvironment environment,
-            IConfiguration configuration,
+            IReceiptStorageOptions receiptStorage,
             IServiceProvider serviceProvider,
             IReceiptParseQueue parseQueue,
             ILogger<ReceiptManager> logger)
         {
             _db = db;
-            _environment = environment;
-            _configuration = configuration;
+            _receiptStorage = receiptStorage;
             _serviceProvider = serviceProvider;
             _parseQueue = parseQueue;
             _logger = logger;
@@ -62,9 +59,7 @@ namespace MoneyMap.Services
 
         private string GetReceiptsBasePath()
         {
-            // Get from config, default to "receipts" in wwwroot
-            var relativePath = _configuration["Receipts:StoragePath"] ?? "receipts";
-            return Path.Combine(_environment.WebRootPath, relativePath);
+            return _receiptStorage.ReceiptsBasePath;
         }
 
         public async Task<ReceiptUploadResult> UploadReceiptAsync(long transactionId, IFormFile file)