Add admin login and password change endpoints

Introduces POST /login and PATCH /password routes for admin authentication and password management. Adds corresponding schema validation for login and password change, enforces stricter password requirements, and updates adminService with JWT-based profile retrieval and improved token handling.

schemas/admin/players/password/[uuid].js

@@ -2,6 +2,10 @@ const z = require("zod")
 
 module.exports = {
     PATCH: {
+        headers: z.object({
+            "content-type": z.string().regex(/application\/json/i),
+            "authorization": z.string().startsWith("Bearer ")
+        }),
         body: z.object({
             newPassword: z.string()
                 .min(8, { message: "The password must be at least 8 characters long." })