feat: Implement section access validation for agent filtering and refine filterable field retrieval to include only fields from global or assigned sections.

src/profile-fields/profile-fields.service.ts

@@ -235,6 +235,7 @@ export class ProfileFieldsService {
   /**
    * Get all filterable fields (public endpoint for search filters)
    * Returns fields with CHECKBOX_GROUP, SELECT, MULTI_SELECT types that have options
+   * Only includes fields from sections that are global or assigned to at least one agent type
    * De-duplicates by both slug AND name to handle duplicate fields with different slugs
    */
   async getFilterableFields() {
@@ -245,6 +246,14 @@ export class ProfileFieldsService {
         isActive: true,
         fieldType: { in: filterableTypes },
         options: { not: Prisma.JsonNull },
+        // Only include fields from sections that are global or assigned to at least one agent type
+        section: {
+          isActive: true,
+          OR: [
+            { isGlobal: true },
+            { agentTypeSections: { some: {} } },
+          ],
+        },
       },
       select: {
         id: true,