refactor: merge duplicate extension injection blocks in LaunchWithStrategy

Merge binaryDiffer and dirtyStrategy injection into a single
strategy-type dispatch to eliminate duplicate is pattern matching.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: JusterZhu

src/c#/GeneralUpdate.Core/Bootstrap/GeneralUpdateBootstrap.cs

@@ -132,23 +132,17 @@ private async Task<GeneralUpdateBootstrap> LaunchWithStrategy(IStrategy roleStra
             roleStrategy.Create(_configInfo);
 
             var binaryDiffer = ResolveExtension<IBinaryDiffer>();
-            if (binaryDiffer != null)
+            var dirtyStrategy = ResolveExtension<IDirtyStrategy>();
+
+            if (roleStrategy is ClientUpdateStrategy cs2)
             {
-                if (roleStrategy is ClientUpdateStrategy cs2)
-                    cs2.SetBinaryDiffer(binaryDiffer);
-                else if (roleStrategy is UpgradeUpdateStrategy us2)
-                    us2.SetBinaryDiffer(binaryDiffer);
+                if (binaryDiffer != null) cs2.SetBinaryDiffer(binaryDiffer);
+                if (dirtyStrategy != null) cs2.SetDirtyStrategy(dirtyStrategy);
             }
-
-            // Inject binary differ into OS-level strategy for differential patching
-            // Must be called after Create() since _osStrategy is initialized there.
-            var dirtyStrategy = ResolveExtension<IDirtyStrategy>();
-            if (dirtyStrategy != null)
+            else if (roleStrategy is UpgradeUpdateStrategy us2)
             {
-                if (roleStrategy is ClientUpdateStrategy cs2)
-                    cs2.SetDirtyStrategy(dirtyStrategy);
-                else if (roleStrategy is UpgradeUpdateStrategy us2)
-                    us2.SetDirtyStrategy(dirtyStrategy);
+                if (binaryDiffer != null) us2.SetBinaryDiffer(binaryDiffer);
+                if (dirtyStrategy != null) us2.SetDirtyStrategy(dirtyStrategy);
             }
 
             // Check custom skip condition before executing update