chore: fix formatting and lint errors across Makefile, backend, and adminfront

This commit addresses several linting and formatting issues that caused CI checks to fail:
- Makefile: Removed obsolete '--organize-imports-enabled' from Biome and switched to '@biomejs/biome'.
- backend: Fixed spacing and alignment issues according to gofmt.
- adminfront: Fixed multiple unused variables and imports, and configured unsafe fixes in the Biome config to remove dead code.

adminfront/tests/tenants.spec.ts

@@ -258,7 +258,7 @@ test.describe("Tenants Management", () => {
     page,
   }) => {
     await page.setViewportSize({ width: 900, height: 700 });
-    let requestCount = 0;
+    let _requestCount = 0;
 
     await page.route("**/api/v1/admin/tenants**", async (route) => {
       if (route.request().method() !== "GET") {
@@ -266,7 +266,7 @@ test.describe("Tenants Management", () => {
       }
       const url = new URL(route.request().url());
       const cursor = url.searchParams.get("cursor");
-      requestCount += 1;
+      _requestCount += 1;
 
       if (!cursor) {
         return route.fulfill({