fix: address code review feedback

- Add explicit return types to all SearchController methods
- Import necessary types (PaginatedSearchResults, PaginatedEntries)
- Define RecentEntriesResponse interface for type safety
- Ensures compliance with TypeScript strict typing standards

apps/api/src/knowledge/search.controller.ts

@@ -1,9 +1,21 @@
 import { Controller, Get, Query, UseGuards } from "@nestjs/common";
-import { SearchService } from "./services/search.service";
+import { SearchService, PaginatedSearchResults } from "./services/search.service";
 import { SearchQueryDto, TagSearchDto, RecentEntriesDto } from "./dto";
 import { AuthGuard } from "../auth/guards/auth.guard";
 import { WorkspaceGuard, PermissionGuard } from "../common/guards";
 import { Workspace, Permission, RequirePermission } from "../common/decorators";
+import type {
+  PaginatedEntries,
+  KnowledgeEntryWithTags,
+} from "./entities/knowledge-entry.entity";
+
+/**
+ * Response for recent entries endpoint
+ */
+interface RecentEntriesResponse {
+  data: KnowledgeEntryWithTags[];
+  count: number;
+}
 
 /**
  * Controller for knowledge search endpoints
@@ -30,7 +42,7 @@ export class SearchController {
   async search(
     @Workspace() workspaceId: string,
     @Query() query: SearchQueryDto
-  ) {
+  ): Promise<PaginatedSearchResults> {
     return this.searchService.search(query.q, workspaceId, {
       status: query.status,
       page: query.page,
@@ -53,7 +65,7 @@ export class SearchController {
   async searchByTags(
     @Workspace() workspaceId: string,
     @Query() query: TagSearchDto
-  ) {
+  ): Promise<PaginatedEntries> {
     return this.searchService.searchByTags(query.tags, workspaceId, {
       status: query.status,
       page: query.page,
@@ -74,7 +86,7 @@ export class SearchController {
   async recentEntries(
     @Workspace() workspaceId: string,
     @Query() query: RecentEntriesDto
-  ) {
+  ): Promise<RecentEntriesResponse> {
     const entries = await this.searchService.recentEntries(
       workspaceId,
       query.limit || 10,