feat(portal): branded auth pages + legacy email styling + dev redirect override

- New PortalAuthShell component: blurred Port Nimara overhead background +
  circular logo + white rounded card, used by /portal/login,
  /portal/activate, /portal/reset-password
- New email/templates/portal-auth.ts: table-based, responsive (max-width
  600px / width 100%), matching the existing legacy inquiry templates;
  replaces the inline templates that lived in portal-auth.service
- EMAIL_REDIRECT_TO env override: when set, sendEmail routes every
  outbound message to that address regardless of recipient and tags the
  subject with "[redirected from <original>]". Dev/test safety net only;
  unset in production
- Portal password minimum length 12 → 9 (service + both API routes +
  client-side form)
- Dev helper script scripts/dev-trigger-portal-invite.ts: seeds a portal
  user against the first port-nimara client and uses EMAIL_REDIRECT_TO
  as the stored email so the tester can sign in with the address that
  received the activation mail

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

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

@@ -8,6 +8,7 @@ import { Loader2 } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { Label } from '@/components/ui/label';
+import { PortalAuthShell } from '@/components/portal/portal-auth-shell';
 
 export default function PortalLoginPage() {
   const router = useRouter();
@@ -48,74 +49,67 @@ export default function PortalLoginPage() {
   }
 
   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">Sign in to your account</p>
-          </div>
+    <PortalAuthShell>
+      <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">Sign in to your account</p>
+      </div>
 
-          <form onSubmit={handleSubmit} className="space-y-4">
-            <div className="space-y-1.5">
-              <Label htmlFor="email">Email address</Label>
-              <Input
-                id="email"
-                type="email"
-                placeholder="you@example.com"
-                value={email}
-                onChange={(e) => setEmail(e.target.value)}
-                required
-                autoFocus
-                autoComplete="email"
-                disabled={loading}
-              />
-            </div>
-
-            <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 || !password}
-            >
-              {loading ? (
-                <>
-                  <Loader2 className="h-4 w-4 mr-2 animate-spin" />
-                  Signing in…
-                </>
-              ) : (
-                'Sign in'
-              )}
-            </Button>
-          </form>
+      <form onSubmit={handleSubmit} className="space-y-4">
+        <div className="space-y-1.5">
+          <Label htmlFor="email">Email address</Label>
+          <Input
+            id="email"
+            type="email"
+            placeholder="you@example.com"
+            value={email}
+            onChange={(e) => setEmail(e.target.value)}
+            required
+            autoFocus
+            autoComplete="email"
+            disabled={loading}
+          />
         </div>
 
-        <p className="text-center text-xs text-gray-400 mt-4">
-          This portal is for existing clients only.
-        </p>
-      </div>
-    </div>
+        <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-[#007bff] 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-[#007bff] hover:bg-[#0069d9] text-white"
+          disabled={loading || !email || !password}
+        >
+          {loading ? (
+            <>
+              <Loader2 className="h-4 w-4 mr-2 animate-spin" />
+              Signing in…
+            </>
+          ) : (
+            'Sign in'
+          )}
+        </Button>
+      </form>
+
+      <p className="text-center text-xs text-gray-400 mt-6">
+        This portal is for existing clients only.
+      </p>
+    </PortalAuthShell>
   );
 }