feat: implement actual volume percentage calculation for shell analysis

- Add GetComponentVolume() function to calculate component volumes using OTK API
- Add volume_percentage field to ShellAnalysisItem structure
- Calculate total assembly volume at analysis start
- Calculate each component's volume percentage during analysis
- Replace hardcoded 0.0 with actual volume percentages in results

Now each component shows its real volume contribution percentage instead of 0.

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

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

CreoManager.cpp

@@ -1608,6 +1608,11 @@ CreoManager::ShellAnalysisResult CreoManager::AnalyzeShellFeaturesEnhanced(const
             return result;
         }
 
+        // Calculate total assembly volume
+        pfcSolid_ptr assembly_solid = pfcSolid::cast(assembly);
+        pfcMassProperty_ptr total_mass_props = assembly_solid->GetMassProperty(nullptr);
+        double total_volume = total_mass_props->GetVolume();
+
         // Execute multi-directional extreme value projection algorithm (now returns complete analysis data)
         ProjectionAnalysisData analysisData = PerformMultiDirectionalProjectionAnalysis(assembly);
         const std::unordered_set<int>& outerComponentIds = analysisData.outerComponentIds;
@@ -1690,6 +1695,11 @@ CreoManager::ShellAnalysisResult CreoManager::AnalyzeShellFeaturesEnhanced(const
                 item.type = "COMPONENT";
                 item.feature_id = stableFeatureId;  // Use stable feature ID
 
+                // Calculate component volume percentage
+                pfcSolid_ptr comp_solid = pfcSolid::cast(compModel);
+                double comp_volume = GetComponentVolume(comp_solid);
+                item.volume_percentage = (comp_volume / total_volume) * 100.0;
+
                 // Build full path including assembly hierarchy
                 try {
                     pfcModel_ptr currentModel = sessionInfo.session->GetCurrentModel();
@@ -1813,7 +1823,7 @@ CreoManager::ShellAnalysisResult CreoManager::AnalyzeShellFeaturesEnhanced(const
             deletion.type = item.type;
             deletion.reason = item.reason;
             deletion.confidence = item.confidence;
-            deletion.volume_reduction = 0.0;  // Not calculated in projection analysis
+            deletion.volume_reduction = item.volume_percentage;
             deletion.part_file = "";  // Component name is already in 'name'
             deletion.part_path = item.path;  // Use full component path
             deletion.component_type = "COMPONENT";
@@ -3199,6 +3209,11 @@ bool CreoManager::ComponentClassifier::IsSpecificInternalModel(const std::string
     return false;
 }
 
+double CreoManager::GetComponentVolume(pfcSolid_ptr solid) {
+    pfcMassProperty_ptr mass_props = solid->GetMassProperty(nullptr);
+    return mass_props->GetVolume();
+}
+
 bool CreoManager::ComponentClassifier::IsLikelyInternal(const AABB& compAABB, const AABB& globalAABB) {
     // Rule 1: Extremely small components (volume < 0.1% of total)
     Vector3D compSize = compAABB.diagonal();

CreoManager.h

@@ -314,6 +314,7 @@ public:
         std::string reason;
         std::string path;  // 组件完整路径
         bool is_deletable = false;
+        double volume_percentage = 0.0;  // Component volume percentage
     };
 
     struct ShellAnalysisResult {
@@ -418,7 +419,10 @@ public:
     
     // 会话信息获取
     SessionInfo GetSessionInfo();
-    
+
+    // Volume calculation
+    double GetComponentVolume(pfcSolid_ptr solid);
+
     // 字符串转换辅助函数
     std::string XStringToString(const xstring& xstr);