change repair_tool application and add beams for salvager and repair_tool

src/lib/ecs/system/ScrapSystem.h

@@ -28,6 +28,11 @@ public:
     // Removes the scrap and returns its amount, or nullopt if not found.
     std::optional<int> consume(entt::entity entity);
 
+    // Collects a single scrap unit from the pile: decrements its amount by one,
+    // destroying the entity once depleted. Returns true if a scrap was collected,
+    // false if the entity is invalid or already empty (REQ-SHP-SALVAGE).
+    bool collectOne(entt::entity entity);
+
     // Lightweight snapshot for callers that need to iterate all scrap.
     std::vector<ScrapInfo> allScrapInfo() const;