refactor: clean up unused imports and dead code across commands, services, and tests.

src/modules/class/class.service.test.ts

@@ -1,7 +1,6 @@
 import { describe, it, expect, mock, beforeEach } from "bun:test";
 import { classService } from "./class.service";
 import { classes, users } from "@/db/schema";
-import { eq, sql } from "drizzle-orm";
 
 // Define mock functions
 const mockFindMany = mock();