Implemented missing file handling endpoints

Added contract update endpoint

PostFundManagement.Application/Services/Evidence/EvidenceCacheService.cs

@@ -60,6 +60,27 @@ public sealed class EvidenceCacheService(EvidenceService service, IDistributedCa
             return Result.Ok(cached.FromJson<Domain.Models.Evidence[]>());
         }));
 
+    public async ValueTask<Result<string>> GetEvidenceUrlAsync(string evidenceIdHash, CancellationToken cancellationToken = default) =>
+        await Result.Try((Func<ValueTask<Result<string>>>)(async () =>
+        {
+            var cacheKey = HashService.ToMd5Hash($"getevidenceurl-{evidenceIdHash}").Value;
+
+            var cached = await cache.GetStringAsync(cacheKey, cancellationToken);
+
+            if (string.IsNullOrWhiteSpace(cached))
+            {
+                var result = await service.GetEvidenceUrlAsync(evidenceIdHash, cancellationToken);
+
+                if (result.IsFailed) return result;
+
+                await cache.SetStringAsync(cacheKey, result.Value, cancellationToken);
+
+                return result.Value;
+            }
+
+            return Result.Ok(cached);
+        }));
+
     public async ValueTask<Result<Indicator>> GetIndicatorAsync(string indicatorId, CancellationToken cancellationToken = default) =>
         await Result.Try((Func<ValueTask<Result<Indicator>>>)(async () =>
         {