add yard distances management to rule engine

- Introduced new yard distances resource with CRUD operations.
- Created migration for yard distances table with necessary constraints.
- Implemented service and repository for yard distances handling.
- Added controller for API endpoints to manage yard distances.
- Updated rule engine configuration to include yard distances.
- Enhanced rule engine resource page to support yard distance selection.
- Updated contracts and train builder pages to handle new yard distance logic.
- Added error handling utility for better error message extraction.

apps/edr-freight-web/backoffice/src/pages/ruleEngine/RuleEngineResourcePage.tsx

@@ -244,7 +244,12 @@ const RuleEngineResourcePage = () => {
   const { data: wagonTypeOptions, isLoading: wagonTypeOptionsLoading } =
     useWagonTypeOptions(usesWagonTypeField);
   const usesYardField = Boolean(
-    config?.formFields.some((f) => f.name === "originYardId"),
+    config?.formFields.some(
+      (f) =>
+        f.name === "originYardId" ||
+        f.name === "fromYardId" ||
+        f.name === "toYardId",
+    ),
   );
   const { data: yardOptions, isLoading: yardOptionsLoading } =
     useYardOptions(usesYardField);
@@ -347,6 +352,19 @@ const RuleEngineResourcePage = () => {
       // trade actually sits in, so an import can't be configured as if it
       // started inland. Resolved per keystroke because the legal set changes
       // with the direction the admin picks.
+      // Yard-distance endpoints have no country restriction — any yard can pair
+      // with any other; the other end is just excluded so A↔A can't be entered.
+      if (field.name === "fromYardId" || field.name === "toYardId") {
+        const otherEnd = field.name === "fromYardId" ? "toYardId" : "fromYardId";
+        return {
+          ...field,
+          type: "select" as const,
+          optionsFromValues: (values: Record<string, unknown>) =>
+            (yardOptions ?? [])
+              .filter(({ value }) => value !== String(values[otherEnd] ?? ""))
+              .map(({ label, value }) => ({ label, value })),
+        };
+      }
       if (field.name === "originYardId" || field.name === "destinationYardId") {
         const end = field.name === "originYardId" ? "origin" : "destination";
         return {
@@ -604,7 +622,7 @@ const RuleEngineResourcePage = () => {
         title={config.label}
         subtitle={config.subtitle}
         action={
-          canManage ? (
+          canManage && config.slug !== "container-types" ? (
             <Button leftSection={<Plus size={18} />} onClick={openCreate}>
               {addLabel}
             </Button>

apps/edr-freight-web/backoffice/src/pages/ruleEngine/config/resources.ts

@@ -348,6 +348,7 @@ export const RULE_ENGINE_RESOURCES: RuleEngineResourceConfig[] = [
       activeColumn,
     ],
     formFields: [
+      { name: "code", label: "Code", type: "text", required: true },
       { name: "name", label: "Name", type: "text", required: true },
       { name: "capacityTons", label: "Capacity (tons)", type: "number", required: true },
       { name: "lengthMeters", label: "Length (meters)", type: "number", required: true },
@@ -370,6 +371,34 @@ export const RULE_ENGINE_RESOURCES: RuleEngineResourceConfig[] = [
       { name: "isActive", label: "Active", type: "boolean" },
     ],
   },
+  {
+    slug: "yard-distances",
+    label: "Yard Distances",
+    category: "configuration",
+    subtitle: "Rail distance between yard pairs — routes read their segment km from here",
+    searchPlaceholder: "Search by yard name or code...",
+    supportsSearch: true,
+    cardTitleKey: "fromYardLabel",
+    cardSubtitleKey: "toYardLabel",
+    columns: [
+      { id: "fromYardLabel", header: "From yard", accessorKey: "fromYardLabel" },
+      { id: "toYardLabel", header: "To yard", accessorKey: "toYardLabel" },
+      { id: "distanceKm", header: "Distance (km)", accessorKey: "distanceKm", format: "number" },
+    ],
+    formFields: [
+      // Options injected at render from useYardOptions (RuleEngineResourcePage).
+      { name: "fromYardId", label: "From yard", type: "select", required: true, placeholder: "Select yard" },
+      { name: "toYardId", label: "To yard", type: "select", required: true, placeholder: "Select yard" },
+      {
+        name: "distanceKm",
+        label: "Distance (km)",
+        type: "number",
+        required: true,
+        description:
+          "Symmetric — one entry covers both directions. Route segments between these yards use this value.",
+      },
+    ],
+  },
   {
     slug: "priority-configs",
     label: "Priority Rules",