feat(emex): use SchemaViewer for group parts page with image pagination

Replace stacked images + plain table with interactive SchemaViewer (same as PL24).
Backend transforms response to SchemaViewer-compatible format (Part/SchemaPic types).
Add prev/next pagination for groups with multiple schema images.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/catalog/emex-catalog.service.ts

@@ -49,24 +49,19 @@ export interface EmexGroupDto {
 
 interface EmexPartDto {
   id: string;
-  partNumber: string | null;
   name: string;
-  nameOriginal: string | null;
-  description: string | null;
-  oemNumber: string | null;
-  hotspotIndex: number | null;
-  quantity: number | null;
+  oemCode: string;
+  quantity: number;
   position: string | null;
+  hotspotIndex: number | null;
 }
 
 interface EmexSchemaPicDto {
   id: string;
-  imageUrl: string | null;
-  localPath: string | null;
-  hotspots: unknown;
-  width: number | null;
-  height: number | null;
-  sortOrder: number | null;
+  url: string;
+  width: number;
+  height: number;
+  label: string;
 }
 
 export interface EmexGroupPartsDto {
@@ -254,7 +249,25 @@ export class EmexCatalogService {
       .where(eq(emexSchemaPics.groupId, groupId))
       .orderBy(emexSchemaPics.sortOrder);
 
-    const result: EmexGroupPartsDto = { group, parts, schemaPics };
+    // Transform to SchemaViewer-compatible format
+    const formattedParts: EmexPartDto[] = parts.map((p) => ({
+      id: p.id,
+      name: p.name,
+      oemCode: p.partNumber || p.oemNumber || "",
+      quantity: p.quantity ?? 1,
+      position: p.position,
+      hotspotIndex: p.position ? parseInt(p.position, 10) || null : null,
+    }));
+
+    const formattedPics: EmexSchemaPicDto[] = schemaPics.map((sp) => ({
+      id: sp.id,
+      url: sp.imageUrl || "",
+      width: sp.width ?? 0,
+      height: sp.height ?? 0,
+      label: group.name || "",
+    }));
+
+    const result: EmexGroupPartsDto = { group, parts: formattedParts, schemaPics: formattedPics };
     await this.redis.setJson(cacheKey, result, CACHE_TTL.parts);
     return result;
   }