feature：新增关系图谱显示功能，支持查看组织、角色、职业的所有关系连接。

backend/app/api/relationships.py

@@ -108,14 +108,14 @@ async def get_relationship_graph(
         for c in characters
     ]
     
-    # 获取所有关系（边）
+    # 获取所有角色关系（边）
     rels_result = await db.execute(
         select(CharacterRelationship).where(
             CharacterRelationship.project_id == project_id
         )
     )
     relationships = rels_result.scalars().all()
-    
+
     links = [
         RelationshipGraphLink(
             source=r.character_from_id,
@@ -126,8 +126,34 @@ async def get_relationship_graph(
         )
         for r in relationships
     ]
-    
-    logger.info(f"获取项目 {project_id} 的关系图谱：{len(nodes)} 个节点，{len(links)} 条关系")
+
+    # 获取组织成员关系（组织 -> 成员）并追加到图谱边
+    # source 使用组织对应的角色ID（Organization.character_id），确保与节点ID一致
+    members_result = await db.execute(
+        select(OrganizationMember, Organization).join(
+            Organization,
+            OrganizationMember.organization_id == Organization.id
+        ).where(Organization.project_id == project_id)
+    )
+    org_members = members_result.all()
+
+    member_links = [
+        RelationshipGraphLink(
+            source=org.character_id,
+            target=member.character_id,
+            relationship=f"组织成员·{member.position}",
+            intimacy=member.loyalty,
+            status=member.status
+        )
+        for member, org in org_members
+    ]
+
+    links.extend(member_links)
+
+    logger.info(
+        f"获取项目 {project_id} 的关系图谱：{len(nodes)} 个节点，"
+        f"{len(relationships)} 条角色关系，{len(member_links)} 条组织成员关系"
+    )
     return RelationshipGraphData(nodes=nodes, links=links)