feat(referrals): rework reward engine + email-verified landing

Reward engine:
- Recurring milestones (every 3 → +7d, every 5 → +14d) instead of one-time
  tiers capped at 5; idempotent + transactional grants serialised per
  referrer so concurrent qualifications can't double-count.
- Rewards now gated on the referred user's email verification
  (afterEmailVerification hook); already-verified referees (OAuth) qualify
  at apply time.
- Reward days banked as users.referral_credit_days when the referrer has no
  live subscription, consumed on next trial start / activation (no more
  silently lost rewards).
- Accurate cumulative rewardDays in stats; getMyReferrals returns referee
  name/masked email/status.

Hardening / cleanup:
- onConflictDoNothing makes apply idempotent (no unhandled unique violation).
- Anti-fraud: normalizeEmail blocks self-referral via gmail dot/+tag aliases.
- Collision-safe referral code generation at signup.
- Single apply path (welcome onboarding modal); removed duplicate calls in
  register + subscription pages. Input validation on the apply code.

Email verification UX:
- Verification link now lands on a dedicated /email-verified confirmation
  page instead of the deep-linked VIN/search page.

Schema: referrals.status + qualified_at, users.referral_credit_days (0009).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/web/src/routes/_auth/email-verified.tsx

@@ -0,0 +1,43 @@
+import { useAuthStore } from "@/stores/auth.store";
+import { Button } from "@sase/ui";
+import { Link, createFileRoute } from "@tanstack/react-router";
+import { CheckCircle2 } from "lucide-react";
+
+export const Route = createFileRoute("/_auth/email-verified")({
+  component: EmailVerifiedPage,
+});
+
+function EmailVerifiedPage() {
+  const user = useAuthStore((s) => s.user);
+  const isLoading = useAuthStore((s) => s.isLoading);
+  const isAuthed = !isLoading && !!user;
+
+  return (
+    <div className="space-y-8 text-center">
+      <div className="flex flex-col items-center gap-4">
+        <div className="flex size-16 items-center justify-center rounded-full bg-brand/10">
+          <CheckCircle2 className="size-9 text-brand" />
+        </div>
+        <div className="space-y-2">
+          <h1 className="text-2xl font-bold tracking-tight sm:text-3xl">E-postanız doğrulandı</h1>
+          <p className="text-sm text-muted-foreground">
+            Hesabınız başarıyla doğrulandı. Artık tüm özellikleri kullanabilirsiniz.
+          </p>
+        </div>
+      </div>
+
+      {isAuthed ? (
+        <Button asChild className="w-full">
+          <Link to="/dashboard/search">Aramaya Başla</Link>
+        </Button>
+      ) : (
+        <div className="space-y-3">
+          <Button asChild className="w-full">
+            <Link to="/login">Giriş Yap</Link>
+          </Button>
+          <p className="text-xs text-muted-foreground">Devam etmek için hesabınıza giriş yapın.</p>
+        </div>
+      )}
+    </div>
+  );
+}

apps/web/src/routes/_auth/register.tsx

@@ -1,4 +1,3 @@
-import { api } from "@/lib/api-client";
 import { signIn, signUp } from "@/lib/auth-client";
 import { startAction } from "@/lib/faro";
 import { track as trackMeta } from "@/lib/meta-pixel";
@@ -44,13 +43,9 @@ function RegisterPage() {
       await signUp.email({ name, email, password, callbackURL: redirectUrl });
       capture("user_signed_up", { method: "email" });
       trackMeta("CompleteRegistration", { method: "email" });
-      if (refCode.trim()) {
-        try {
-          await api.post("/referrals/apply", { code: refCode.trim().toUpperCase() });
-        } catch {
-          // Geçersiz/kullanılmış kod — sessizce geç
-        }
-      }
+      // The referral code travels via `?ref=` in redirectUrl; the welcome
+      // onboarding modal on the search page is the single place that applies it
+      // (covers both email and Google OAuth signups).
       toast.success("Hesap oluşturuldu!");
       window.location.href = redirectUrl;
     } catch {

apps/web/src/routes/dashboard/subscription/index.tsx

@@ -174,8 +174,6 @@ export function SubscriptionPage() {
 
   // ─── Search-param-driven flags (read once) ─────────────────────────────────
   const [welcome] = useState(() => search.welcome === "1");
-  const [initialRef] = useState(() => search.ref ?? null);
-  const hasAppliedRefRef = useRef(false);
   const stripeResultRef = useRef(false);
 
   // ─── Stepper state ─────────────────────────────────────────────────────────
@@ -299,12 +297,6 @@ export function SubscriptionPage() {
     }
   }, [subscription, currentPlanKey]);
 
-  useEffect(() => {
-    if (!initialRef || !subData || hasAppliedRefRef.current) return;
-    hasAppliedRefRef.current = true;
-    api.post("/referrals/apply", { code: initialRef.toUpperCase().trim() }).catch(() => {});
-  }, [initialRef, subData]);
-
   useEffect(() => {
     if (!welcome || !subData || hasFiredRef.current) return;
     if (!eligibleForTrial) {