feat: Souq native integration + auth simplification + CE-wide enhancements

Souq Marketplace:
- Native souq pages: browse+filters, create listing, detail+seller profile, orders+chat
- New API: reviews (POST), sellers/[id], upload (multipart), polar-checkout webhook
- Listings API enhanced: minPrice, maxPrice, sortBy, deliveryDays filters
- Seller workflow: start order, mark delivered, upload files, confirm delivery
- Wallet: 5 Polar.sh FLH tiers, production checkout, mock fallback, success banner
- Fix: order redirect /souq/history → /souq/orders

Auth System:
- Unified auth page, removed OAuth provider routing (2 files deleted)
- Deleted oauth.ts (319 lines) — simplified auth chain
- Streamlined login/register API routes

Prisma Schema (+179 lines):
- New models: Listing, Purchase, Review, Group/GroupMember
- Gamification: DailyStreak, XpTransaction, Achievement, UserLevel
- Learning: LearnCourse/Module/Enrollment/Certificate
- Notifications, Referrals, Dhikr, PremiumBenefits

Deleted legacy code:
- src/app/api/marketplace/* (3 files) — replaced by /api/souq/*
- src/app/api/files/[listingId]/route.ts — replaced by /api/souq/upload
- src/app/api/seller/[sellerId]/route.ts — replaced by /api/souq/sellers/[id]

Infrastructure:
- Dockerfile: standalone output, Prisma runtime migration
- docker-compose.yml: Polar env vars, healthcheck fix
- docker-compose.staging.yml: staging on port 4014
- .gitea/workflows/ci.yml: CI pipeline

src/components/PWARegister.tsx

@@ -0,0 +1,29 @@
+"use client";
+
+import { useEffect } from "react";
+
+export default function PWARegister() {
+  useEffect(() => {
+    if ("serviceWorker" in navigator) {
+      navigator.serviceWorker
+        .register("/mobile/sw.js", { scope: "/mobile" })
+        .then((reg) => {
+          console.log("[PWA] SW registered:", reg.scope);
+        })
+        .catch((err) => console.warn("[PWA] SW registration failed:", err));
+
+      // Listen for beforeinstallprompt (Android Chrome)
+      window.addEventListener("beforeinstallprompt", (e) => {
+        e.preventDefault();
+        (window as Record<string, unknown>).__deferredPrompt = e;
+      });
+
+      window.addEventListener("appinstalled", () => {
+        console.log("[PWA] App installed");
+        (window as Record<string, unknown>).__deferredPrompt = null;
+      });
+    }
+  }, []);
+
+  return null;
+}