refactor: modular build items and root part come from ModularBuildComponent

ModularBuildFinish hardcoded the item a finished build becomes (6416 for 3
parts, 8092 for 7) and the car chassis part (8129) that the every-part-
swapped check skips. They now come from ModularBuildComponent: createdLOT,
<numberOfParts> and the <ExamplePartLOT> of the <rootPart> module (new
CDModularBuildComponentTable). Same results with the 1.10.64 cdclient;
tests cover the xml parsing and the lookup.

Refs #691

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dDatabase/CDClientDatabase/CDClientTables/CDModularBuildComponentTable.h

@@ -0,0 +1,27 @@
+#pragma once
+#include "CDTable.h"
+#include "dCommonVars.h"
+
+#include <optional>
+#include <string_view>
+
+// A modular build (rocket, car): ModularBuildComponent with what DLU needs from its xml
+struct CDModularBuildComponent {
+	uint32_t id{};
+	int32_t buildType{};
+	LOT createdLOT{ LOT_NULL };       // the item the finished build becomes
+	uint32_t numberOfParts{};          // <topology><numberOfParts value>
+	LOT rootPartExampleLOT{ LOT_NULL }; // <Module><ExamplePartLOT> of the module whose PartCode is <rootPart value>
+};
+
+class CDModularBuildComponentTable : public CDTable<CDModularBuildComponentTable, std::vector<CDModularBuildComponent>> {
+public:
+	void LoadValuesFromDatabase();
+
+	// The first build made of this many parts
+	std::optional<CDModularBuildComponent> GetByNumberOfParts(uint32_t numberOfParts) const;
+
+	// Fills numberOfParts and rootPartExampleLOT from a ModularBuildComponent.xml
+	static void ParseXml(std::string_view xml, CDModularBuildComponent& build);
+	static std::optional<CDModularBuildComponent> FindByNumberOfParts(const std::vector<CDModularBuildComponent>& builds, uint32_t numberOfParts);
+};