fix: correct test mock paths from "./db" to "../db"

Fixes incorrect vi.mock paths that were causing tests to fail.
The mock path should match the import path in the route files.

This addresses the authProvider test mock path issue on PR #2.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/__tests__/confirmation.test.ts

@@ -39,7 +39,7 @@ function resetMock() {
   lastUpdate = {};
 }
 
-vi.mock("./db", () => {
+vi.mock("../db", () => {
   const appointments = new Proxy(
     { _name: "appointments" },
     { get: (t, p) => (p === "_name" ? "appointments" : { table: "appointments", column: p }) }