fix(auth): normalize AUTH_TYPE to uppercase to prevent silent redirect loop

[alex-percy]

Summary

One-line fix: adds .toUpperCase() when reading the AUTH_TYPE environment variable in the frontend, so that lowercase values like db correctly match the uppercase AuthType enum ("DB").

Problem

Setting AUTH_TYPE=db (lowercase) works on the backend (Python, case-insensitive) but silently breaks the frontend. The AuthType enum and backward-compat constants are all uppercase:

// utils/authenticationType.ts
export enum AuthType {
  DB = "DB",
  NOAUTH = "NOAUTH",
  // ...
}
export const MULTI_TENANT = "MULTI_TENANT";
export const SINGLE_TENANT = "SINGLE_TENANT";
export const NO_AUTH = "NO_AUTH";

But auth.config.ts compared the raw env value without normalizing:

const authTypeEnv = runtimeEnv("AUTH_TYPE"); // "db"
// ... none of the comparisons match "db" ...
: (authTypeEnv as AuthType); // "db" cast — not "DB"

This causes baseProviderConfigs["db"] to return undefined, silently falling back to the NoAuth credentials provider. The signin page then auto-calls signIn("credentials"), creating a NextAuth session without a valid Keep JWT, which produces an infinite redirect loop with no error message.

Fix

-const authTypeEnv = runtimeEnv("AUTH_TYPE");
+const authTypeEnv = runtimeEnv("AUTH_TYPE")?.toUpperCase();

All enum values and backward-compat constants are already uppercase, so this is safe.

Fixes #6809

[CLAassistant]

All committers have signed the CLA.

[shahargl]

Lgtm

[github-actions]

💪 Fantastic work @alex-percy! Your very first PR to keep has been merged! 🎉🥳

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 30.43%. Comparing base (620adaf) to head (62522b1).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6810      +/-   ##
==========================================
- Coverage   30.45%   30.43%   -0.02%     
==========================================
  Files         101      101              
  Lines       11785    11791       +6     
==========================================
  Hits         3589     3589              
- Misses       8196     8202       +6     

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