feat: add better auth sqlite runtime and server-side session flow

server/auth/validation.ts

@@ -0,0 +1,24 @@
+import { z } from "zod";
+
+export const authCredentialsSchema = z.object({
+  email: z.email().transform((value) => normalizeAuthEmail(value)),
+  password: z.string().min(8).max(128),
+});
+
+export type AuthCredentials = z.infer<typeof authCredentialsSchema>;
+
+export function parseAuthCredentials(formData: FormData): AuthCredentials {
+  return authCredentialsSchema.parse({
+    email: formData.get("email"),
+    password: formData.get("password"),
+  });
+}
+
+export function normalizeAuthEmail(value: string): string {
+  return value.trim().toLowerCase();
+}
+
+export function getDefaultDisplayName(email: string): string {
+  return email.split("@")[0] || "Neta Kullanıcısı";
+}
+