Add auth URL config module with validation (TDD)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/config/auth.test.ts

@@ -0,0 +1,47 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { resolveAuthConfig } from './auth';
+
+describe('resolveAuthConfig', () => {
+  it('returns both URLs and sales email from env', () => {
+    const cfg = resolveAuthConfig({
+      PUBLIC_AUTH_SIGNIN_URL: 'https://auth.cameleer.io/sign-in',
+      PUBLIC_AUTH_SIGNUP_URL: 'https://auth.cameleer.io/sign-in?first_screen=register',
+      PUBLIC_SALES_EMAIL: 'sales@cameleer.io',
+    });
+    expect(cfg.signInUrl).toBe('https://auth.cameleer.io/sign-in');
+    expect(cfg.signUpUrl).toBe('https://auth.cameleer.io/sign-in?first_screen=register');
+    expect(cfg.salesEmail).toBe('sales@cameleer.io');
+  });
+
+  it('throws if PUBLIC_AUTH_SIGNIN_URL is missing', () => {
+    expect(() => resolveAuthConfig({
+      PUBLIC_AUTH_SIGNUP_URL: 'https://auth.cameleer.io/sign-in?first_screen=register',
+      PUBLIC_SALES_EMAIL: 'sales@cameleer.io',
+    })).toThrow(/PUBLIC_AUTH_SIGNIN_URL/);
+  });
+
+  it('throws if a URL is not https', () => {
+    expect(() => resolveAuthConfig({
+      PUBLIC_AUTH_SIGNIN_URL: 'http://auth.cameleer.io/sign-in',
+      PUBLIC_AUTH_SIGNUP_URL: 'https://auth.cameleer.io/sign-in?first_screen=register',
+      PUBLIC_SALES_EMAIL: 'sales@cameleer.io',
+    })).toThrow(/must be https/);
+  });
+
+  it('throws if sales email is not a valid mailto target', () => {
+    expect(() => resolveAuthConfig({
+      PUBLIC_AUTH_SIGNIN_URL: 'https://auth.cameleer.io/sign-in',
+      PUBLIC_AUTH_SIGNUP_URL: 'https://auth.cameleer.io/sign-in?first_screen=register',
+      PUBLIC_SALES_EMAIL: 'not-an-email',
+    })).toThrow(/PUBLIC_SALES_EMAIL/);
+  });
+
+  it('exposes signUpUrl distinct from signInUrl', () => {
+    const cfg = resolveAuthConfig({
+      PUBLIC_AUTH_SIGNIN_URL: 'https://auth.cameleer.io/sign-in',
+      PUBLIC_AUTH_SIGNUP_URL: 'https://auth.cameleer.io/sign-in?first_screen=register',
+      PUBLIC_SALES_EMAIL: 'sales@cameleer.io',
+    });
+    expect(cfg.signUpUrl).not.toBe(cfg.signInUrl);
+  });
+});