fix: remove unused ToVersion from sample server and client code

- Remove ToVersion field from VerificationResultDTO
- Remove ToVersion from VersionEntry record in Program.cs
- Update display strings to remove ToVersion reference

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: JusterZhu

src/Hub/Samples/OssSample.cs

@@ -70,7 +70,7 @@ public async Task RunAsync(AppConfig config, CancellationToken ct)
                     foreach (var v in e.Info.Body)
                     {
                         var type = v.IsCrossVersion == true
-                            ? $"[差分 {v.FromVersion}→{v.ToVersion}]"
+                            ? $"[差分 {v.FromVersion}]"
                             : "[完整包]";
                         Console.WriteLine($"    v{v.Version}  {type}");
                         Console.WriteLine($"      Name: {v.Name}");

src/Server/DTOs/VerificationResultDTO.cs

@@ -86,9 +86,4 @@ public record VerificationResultDTO
     /// 跨版本升级的源版本号
     /// </summary>
     public string? FromVersion { get; set; }
-
-    /// <summary>
-    /// 跨版本升级的目标版本号
-    /// </summary>
-    public string? ToVersion { get; set; }
 }

src/Server/Program.cs

@@ -91,14 +91,14 @@
             Format = v.Format ?? ".zip", Size = v.Size, IsFreeze = v.IsFreeze,
             UpgradeMode = requestUpgradeMode,
             IsCrossVersion = v.IsCrossVersion ?? false,
-            FromVersion = v.FromVersion, ToVersion = v.ToVersion
+            FromVersion = v.FromVersion
         });
     }
 
     var modeLabel = requestUpgradeMode == 2 ? "CrossVersion" : "VersionChain";
     Console.WriteLine($"[Verification] Returning {results.Count} packages (Mode: {modeLabel})");
     foreach (var r in results)
-        Console.WriteLine($"    {r.Version} — {r.Name} ({(r.IsCrossVersion == true ? $"Cross {r.FromVersion}→{r.ToVersion}" : "Full")})");
+        Console.WriteLine($"    {r.Version} — {r.Name} ({(r.IsCrossVersion == true ? $"Cross {r.FromVersion}" : "Full")})");
 
     return Results.Ok(HttpResponseDTO<IEnumerable<VerificationResultDTO>>.Success(results,
         $"Found {results.Count} update(s)."));
@@ -169,7 +169,7 @@
 if (versionStore.Count > 0)
 {
     foreach (var v in versionStore.OrderBy(v => new Version(v.Version!)))
-        Console.WriteLine($"  {v.Version,-12} AppType={v.AppType} {(v.IsCrossVersion == true ? $"Cross {v.FromVersion}→{v.ToVersion}" : "Full")}  {v.PacketName}");
+        Console.WriteLine($"  {v.Version,-12} AppType={v.AppType} {(v.IsCrossVersion == true ? $"Cross {v.FromVersion}" : "Full")}  {v.PacketName}");
 }
 else
 {
@@ -240,5 +240,4 @@ record VersionEntry
     public bool? IsFreeze { get; set; }
     public bool? IsCrossVersion { get; set; }
     public string? FromVersion { get; set; }
-    public string? ToVersion { get; set; }
 }