feat(contents): add update endpoint to contents controller

- Introduced a `PATCH /:id` endpoint to enable partial content updates.
- Integrated AuthGuard for securing the endpoint.

backend/src/contents/contents.controller.ts

@@ -174,6 +174,16 @@ export class ContentsController {
 		return this.contentsService.incrementUsage(id);
 	}
 
+	@Patch(":id")
+	@UseGuards(AuthGuard)
+	update(
+		@Param("id") id: string,
+		@Req() req: AuthenticatedRequest,
+		@Body() updateContentDto: any,
+	) {
+		return this.contentsService.update(id, req.user.sub, updateContentDto);
+	}
+
 	@Delete(":id")
 	@UseGuards(AuthGuard)
 	remove(@Param("id") id: string, @Req() req: AuthenticatedRequest) {