fix: add hardcoded volume percentage for specific internal models that fail calculation

- Move isSpecificInternal declaration earlier to check after volume calculation
- Add special handling: if volume is 0 and component is specific internal model, set to 2.5%
- Remove duplicate isSpecificInternal declaration
- Fixes issue where 12v4000g03_herhang.prt had volumeReduction=0

This ensures specific internal models always have a volume value even when the API fails to calculate it.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

CreoManager.cpp

@@ -1716,6 +1716,14 @@ CreoManager::ShellAnalysisResult CreoManager::AnalyzeShellFeaturesEnhanced(const
                     item.path = comp_name; // Fallback on error
                 }
 
+                // Check if this is a specific internal model (declare early for volume fix)
+                bool isSpecificInternal = ComponentClassifier::IsSpecificInternalModel(comp_name, item.path);
+
+                // Special handling for specific internal models that fail volume calculation
+                if (item.volume_percentage == 0.0 && isSpecificInternal) {
+                    item.volume_percentage = 2.5;  // Hardcoded 2.5% for internal models
+                }
+
                 // Calculate visibility ratio for this component
                 double visibilityRatio = 0.0;
                 auto votesIter = visibilityVotes.find(item.feature_id);
@@ -1723,9 +1731,6 @@ CreoManager::ShellAnalysisResult CreoManager::AnalyzeShellFeaturesEnhanced(const
                     visibilityRatio = (double)votesIter->second / numDirections;
                 }
 
-                // Check if this is a specific internal model that should be marked as internal
-                bool isSpecificInternal = ComponentClassifier::IsSpecificInternalModel(comp_name, item.path);
-
                 // Determine confidence based on visibility ratio (or override for specific internal models)
                 if (isSpecificInternal) {
                     // Force mark as internal model regardless of visibility