feat(portal): replace magic-link with email/password + admin-initiated activation

The client portal no longer uses passwordless / magic-link sign-in. Each
client now has a `portal_users` row with a scrypt-hashed password,
created by an admin from the client detail page; the admin's invite
mails an activation link that the client uses to set their own password.
Forgot-password is wired through the same token mechanism.

Schema (migration `0009_outgoing_rumiko_fujikawa.sql`):

- `portal_users` — one per client account, separate from the CRM
  `users` table (better-auth) so the auth realms stay isolated. Email
  is globally unique, password is null until activation.
- `portal_auth_tokens` — single-use activation / reset tokens. Stores
  only the SHA-256 hash so a DB compromise never leaks live tokens.

Services:

- `src/lib/portal/passwords.ts` — scrypt hash/verify (no new deps;
  uses node:crypto), token mint+hash helpers.
- `src/lib/services/portal-auth.service.ts` — createPortalUser,
  resendActivation, activateAccount, signIn (timing-safe),
  requestPasswordReset, resetPassword. Auth failures throw the new
  UnauthorizedError (401); enumeration-safe behaviour everywhere.

Routes:

- POST /api/portal/auth/sign-in — sets the existing portal JWT cookie.
- POST /api/portal/auth/forgot-password — always 200.
- POST /api/portal/auth/reset-password — token + new password.
- POST /api/portal/auth/activate — token + initial password.
- POST /api/v1/clients/:id/portal-user — admin invite (and `?action=resend`).
- Removed: /api/portal/auth/request, /api/portal/auth/verify (magic link).

UI:

- /portal/login — replaced email-only magic-link form with email +
  password + "forgot password" link.
- /portal/forgot-password, /portal/reset-password, /portal/activate — new.
- New shared `PasswordSetForm` component used by activate + reset.
- New `PortalInviteButton` rendered on the client detail header.

Email send:

- `createTransporter` now wires SMTP auth when SMTP_USER+SMTP_PASS are
  set (gmail app-password or marina-server creds, configured via env).
- `SMTP_FROM` env var lets the sender address be overridden without
  pinning it to `noreply@${SMTP_HOST}`.

Tests:

- Smoke spec 17 (client-portal) updated to the new flow: 7/7 green.
- Smoke specs 02-crud-spine, 05-invoices, 20-critical-path updated to
  match the post-refactor client + invoice forms (drop companyName,
  use OwnerPicker + billingEmail).
- Vitest 652/652 still green; type-check clean.

Drops the dead `requestMagicLink` from portal.service.ts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/(portal)/portal/login/page.tsx

@@ -1,15 +1,22 @@
 'use client';
 
+import Link from 'next/link';
+import { useRouter, useSearchParams } from 'next/navigation';
 import { useState } from 'react';
-import { Mail, Loader2 } from 'lucide-react';
+import { Loader2 } from 'lucide-react';
+
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { Label } from '@/components/ui/label';
 
 export default function PortalLoginPage() {
+  const router = useRouter();
+  const search = useSearchParams();
+  const next = search.get('next') ?? '/portal/dashboard';
+
   const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
   const [loading, setLoading] = useState(false);
-  const [submitted, setSubmitted] = useState(false);
   const [error, setError] = useState('');
 
   async function handleSubmit(e: React.FormEvent) {
@@ -18,59 +25,35 @@ export default function PortalLoginPage() {
     setLoading(true);
 
     try {
-      const res = await fetch('/api/portal/auth/request', {
+      const res = await fetch('/api/portal/auth/sign-in', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ email }),
+        body: JSON.stringify({ email, password }),
       });
 
       if (!res.ok) {
         const data = await res.json().catch(() => ({}));
-        setError((data as { error?: string }).error ?? 'Something went wrong. Please try again.');
+        setError((data as { error?: string }).error ?? 'Invalid email or password');
         return;
       }
 
-      setSubmitted(true);
+      // typedRoutes: `next` is a runtime string we can't statically check.
+      router.replace(next as never);
+      router.refresh();
     } catch {
-      setError('Unable to connect. Please check your connection and try again.');
+      setError('Unable to connect. Please try again.');
     } finally {
       setLoading(false);
     }
   }
 
-  if (submitted) {
-    return (
-      <div className="min-h-screen flex items-center justify-center bg-gray-50 px-4">
-        <div className="w-full max-w-md text-center">
-          <div className="inline-flex items-center justify-center w-14 h-14 rounded-full bg-green-50 mb-4">
-            <Mail className="h-7 w-7 text-green-600" />
-          </div>
-          <h1 className="text-xl font-semibold text-gray-900 mb-2">Check your email</h1>
-          <p className="text-gray-500 text-sm leading-relaxed">
-            If <strong>{email}</strong> is associated with a client account, you will receive a
-            sign-in link shortly. The link expires in 24 hours.
-          </p>
-          <button
-            type="button"
-            onClick={() => { setSubmitted(false); setEmail(''); }}
-            className="mt-6 text-sm text-[#1e2844] hover:underline"
-          >
-            Try a different email
-          </button>
-        </div>
-      </div>
-    );
-  }
-
   return (
     <div className="min-h-screen flex items-center justify-center bg-gray-50 px-4">
       <div className="w-full max-w-sm">
         <div className="bg-white rounded-lg border p-8 shadow-sm">
           <div className="text-center mb-6">
             <h1 className="text-xl font-semibold text-gray-900">Client Portal</h1>
-            <p className="text-sm text-gray-500 mt-1">
-              Enter your email to receive a sign-in link
-            </p>
+            <p className="text-sm text-gray-500 mt-1">Sign in to your account</p>
           </div>
 
           <form onSubmit={handleSubmit} className="space-y-4">
@@ -84,26 +67,46 @@ export default function PortalLoginPage() {
                 onChange={(e) => setEmail(e.target.value)}
                 required
                 autoFocus
+                autoComplete="email"
                 disabled={loading}
               />
             </div>
 
-            {error && (
-              <p className="text-sm text-red-600">{error}</p>
-            )}
+            <div className="space-y-1.5">
+              <div className="flex items-center justify-between">
+                <Label htmlFor="password">Password</Label>
+                <Link
+                  href="/portal/forgot-password"
+                  className="text-xs text-[#1e2844] hover:underline"
+                >
+                  Forgot password?
+                </Link>
+              </div>
+              <Input
+                id="password"
+                type="password"
+                value={password}
+                onChange={(e) => setPassword(e.target.value)}
+                required
+                autoComplete="current-password"
+                disabled={loading}
+              />
+            </div>
+
+            {error && <p className="text-sm text-red-600">{error}</p>}
 
             <Button
               type="submit"
               className="w-full bg-[#1e2844] hover:bg-[#1e2844]/90 text-white"
-              disabled={loading || !email}
+              disabled={loading || !email || !password}
             >
               {loading ? (
                 <>
                   <Loader2 className="h-4 w-4 mr-2 animate-spin" />
-                  Sending link...
+                  Signing in…
                 </>
               ) : (
-                'Send sign-in link'
+                'Sign in'
               )}
             </Button>
           </form>