refactor(diagram): remove unused edge types and method

Clean up CodeTopologyEntityEdge by deleting predefined edge constants and the unused getEdgeData method. Simplify getQualifiedName implementation in CodeTopologyVfsResolver.

Author: phodal

exts/ext-diagram/src/241/main/kotlin/cc/unitmesh/diagram/diagram/CodeTopologyVfsResolver.kt

@@ -10,12 +10,7 @@ import cc.unitmesh.diagram.model.GraphNodeData
  */
 class CodeTopologyVfsResolver : DiagramVfsResolver<GraphNodeData> {
 
-    override fun getQualifiedName(data: GraphNodeData?): String? {
-        if (data == null) return null
-        
-        val name = data.getName()
-        return if (name.isNotEmpty()) name else null
-    }
+    override fun getQualifiedName(data: GraphNodeData?): String? = data?.getName()
 
     override fun resolveElementByFQN(fqn: String, project: Project): GraphNodeData? {
         // For now, we don't support resolving elements by FQN

exts/ext-diagram/src/241/main/kotlin/cc/unitmesh/diagram/diagram/graph/CodeTopologyEntityEdge.kt

@@ -66,35 +66,8 @@ class CodeTopologyEntityEdge(
 
             return builder.create()
         }
-        
-        // Predefined relationship types for common Graphviz edge styles
-        val DIRECTED_EDGE = DiagramRelationshipInfoAdapter.Builder()
-            .setName("DIRECTED")
-            .setLineType(DiagramLineType.SOLID)
-            .setSourceArrow(DiagramRelationshipInfo.NONE)
-            .setTargetArrow(DiagramRelationshipInfo.ANGLE)
-            .create()
-            
-        val UNDIRECTED_EDGE = DiagramRelationshipInfoAdapter.Builder()
-            .setName("UNDIRECTED")
-            .setLineType(DiagramLineType.SOLID)
-            .setSourceArrow(DiagramRelationshipInfo.NONE)
-            .setTargetArrow(DiagramRelationshipInfo.NONE)
-            .create()
-            
-        val DASHED_EDGE = DiagramRelationshipInfoAdapter.Builder()
-            .setName("DASHED")
-            .setLineType(DiagramLineType.DASHED)
-            .setSourceArrow(DiagramRelationshipInfo.NONE)
-            .setTargetArrow(DiagramRelationshipInfo.ANGLE)
-            .create()
     }
-    
-    /**
-     * Get the edge data
-     */
-    fun getEdgeData(): GraphEdgeData = edgeData
-    
+
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (other !is CodeTopologyEntityEdge) return false