feat(repair): support multiple required parts and per-part case anchor

- RepairMissionConfig.requiredReplacementPartId (string) is replaced by
  requiredReplacementPartIds (readonly string[]) so a mission can accept
  several alternative correct parts (e.g. pylon will accept either cable).
- RepairMissionPartConfig gains optional caseAnchor (where the standalone
  spawns inside packderelance), caseLockGroup (mutually exclusive parts),
  and targetNodeName (snap onto a node of the broken model rather than a
  placeholder slot in the case).
- RepairScannedBrokenPart gains targetNodeName so scan results can carry
  this hint through to the repairing step.
- RepairRepairingStep validation logic (placed/wrong/feedback) now matches
  any id in requiredReplacementPartIds. Existing data is migrated mechanically
  (single-element arrays); part-level new fields are wired in subsequent
  commits.

src/data/gameplay/repairMissions.ts

@@ -25,7 +25,7 @@ export const REPAIR_MISSIONS: Record<RepairMissionId, RepairMissionConfig> = {
     interactUiPath: REPAIR_INTERACT_UI_PATH,
     brokenUiPath: REPAIR_BROKEN_UI_PATH,
     case: DEFAULT_REPAIR_CASE,
-    requiredReplacementPartId: "ebike-cooling-core-replacement",
+    requiredReplacementPartIds: ["ebike-cooling-core-replacement"],
     brokenParts: [
       {
         id: "ebike-cooling-core",
@@ -59,7 +59,7 @@ export const REPAIR_MISSIONS: Record<RepairMissionId, RepairMissionConfig> = {
     brokenUiPath: REPAIR_BROKEN_UI_PATH,
     case: DEFAULT_REPAIR_CASE,
     reassemblySeconds: 1.8,
-    requiredReplacementPartId: "pylon-grid-relay-replacement",
+    requiredReplacementPartIds: ["pylon-grid-relay-replacement"],
     scanPartSeconds: 1.4,
     brokenParts: [
       {
@@ -104,7 +104,7 @@ export const REPAIR_MISSIONS: Record<RepairMissionId, RepairMissionConfig> = {
     brokenUiPath: REPAIR_BROKEN_UI_PATH,
     case: DEFAULT_REPAIR_CASE,
     reassemblySeconds: 1.2,
-    requiredReplacementPartId: "farm-irrigation-pump-replacement",
+    requiredReplacementPartIds: ["farm-irrigation-pump-replacement"],
     scanPartSeconds: 0.9,
     brokenParts: [
       {