Improve sso auth flow (#6205)

Co-authored-by: Timshel <timshel@users.noreply.github.com>

migrations/postgresql/2025-08-20-120000_sso_nonce_to_auth/down.sql

@@ -0,0 +1,9 @@
+DROP TABLE IF EXISTS sso_auth;
+
+CREATE TABLE sso_nonce (
+    state               TEXT NOT NULL PRIMARY KEY,
+    nonce               TEXT NOT NULL,
+    verifier            TEXT,
+    redirect_uri        TEXT NOT NULL,
+    created_at          TIMESTAMP NOT NULL DEFAULT now()
+);

migrations/postgresql/2025-08-20-120000_sso_nonce_to_auth/up.sql

@@ -0,0 +1,12 @@
+DROP TABLE IF EXISTS sso_nonce;
+
+CREATE TABLE sso_auth (
+    state               TEXT NOT NULL PRIMARY KEY,
+    client_challenge    TEXT NOT NULL,
+    nonce               TEXT NOT NULL,
+    redirect_uri        TEXT NOT NULL,
+    code_response       TEXT,
+    auth_response       TEXT,
+    created_at          TIMESTAMP NOT NULL DEFAULT now(),
+    updated_at          TIMESTAMP NOT NULL DEFAULT now()
+);