Refactor API routes and enhance documentation; add collaboration features and user role management. Update environment example and improve error handling in authentication.

src/server/auth/config.ts

@@ -1,16 +1,10 @@
-import { DrizzleAdapter } from "@auth/drizzle-adapter";
 import { type DefaultSession, type NextAuthConfig } from "next-auth";
 import Credentials from "next-auth/providers/credentials";
 import bcrypt from "bcryptjs";
 import { eq } from "drizzle-orm";
 
 import { db } from "~/server/db";
-import {
-  accounts,
-  sessions,
-  users,
-  verificationTokens,
-} from "~/server/db/schema";
+import { users } from "~/server/db/schema";
 
 /**
  * Module augmentation for `next-auth` types. Allows us to add custom properties to the `session`
@@ -55,7 +49,7 @@ export const authConfig = {
           where: eq(users.email, credentials.email as string),
         });
 
-        if (!user || !user.password) {
+        if (!user?.password) {
           return null;
         }