refactor: rename marketplace to storefront across the entire monorepo

Comprehensive rename of all marketplace references to storefront:
- API module: apps/api/src/modules/marketplace/ → storefront/
- Components: MarketplaceHeader → StorefrontHeader, MarketplaceShell →
  StorefrontShell, MarketplaceFooter → StorefrontFooter
- Types: marketplace-homepage.ts → storefront-homepage.ts
- Test files: employee-marketplace-* → employee-storefront-*
- All source code identifiers, imports, route paths, and strings
- Documentation (docs/), CI config (.gitlab-ci.yml), scripts
- Dashboard, admin, storefront workspace references
- Prisma field names preserved (isListedOnMarketplace, marketplaceRating,
  marketplaceFunnelEvent) as they map to database schema

Validation:
- API type-check: 0 errors
- Storefront type-check: 0 errors
- Dashboard type-check: 0 errors
- Full monorepo type-check: only pre-existing admin TS18046

docs/README.md

@@ -1,10 +1,10 @@
-# 🚗 RentalDriveGo— Multi-Tenant Car Rental SaaS + Marketplace
+# 🚗 RentalDriveGo— Multi-Tenant Car Rental SaaS + Storefront
 
 ## Platform Model
 
 **Rental Companies (B2B)** — pay RentalDriveGoa subscription (AmanPay or PayPal), get:
 - A fully private dashboard (zero data overlap with any other company)
-- Fleet management with vehicle photo upload (photos auto-appear on global marketplace)
+- Fleet management with vehicle photo upload (photos auto-appear on global storefront)
 - Promotional offers management
 - A white-label site at `company.RentalDriveGo.com` where renters book and pay
 
@@ -29,21 +29,21 @@
 
 ---
 
-## 🌐 Marketplace is Discovery Only — No Booking on RentalDriveGo.com/explore
+## 🌐 Storefront is Discovery Only — No Booking on RentalDriveGo.com/explore
 
-The global marketplace shows all vehicles with photos from all companies. When a renter clicks "Book this vehicle", they are **redirected to the company's branded site** (`{slug}.RentalDriveGo.com/book?vehicleId=X&from=Y&to=Z&ref=marketplace`). The booking form is pre-filled. All payment happens on the company site using the company's own payment accounts.
+The global storefront shows all vehicles with photos from all companies. When a renter clicks "Book this vehicle", they are **redirected to the company's branded site** (`{slug}.RentalDriveGo.com/book?vehicleId=X&from=Y&to=Z&ref=storefront`). The booking form is pre-filled. All payment happens on the company site using the company's own payment accounts.
 
 ---
 
-## 📸 Vehicle Photos → Marketplace Visibility
+## 📸 Vehicle Photos → Storefront Visibility
 
 ```
 Company uploads photos in /dashboard/fleet
   → Stored in Cloudinary
   → Vehicle.photos[] holds the URLs
-  → First photo = cover image on marketplace cards
-  → All photos shown in marketplace vehicle gallery
-  → isPublished=true makes vehicle appear on marketplace
+  → First photo = cover image on storefront cards
+  → All photos shown in storefront vehicle gallery
+  → isPublished=true makes vehicle appear on storefront
 ```
 
 ---
@@ -52,7 +52,7 @@ Company uploads photos in /dashboard/fleet
 
 ```
 Layer 1A: RentalDriveGo.com              — B2B marketing site
-Layer 1B: RentalDriveGo.com/explore      — B2C marketplace (discovery + redirect only)
+Layer 1B: RentalDriveGo.com/explore      — B2C storefront (discovery + redirect only)
 Layer 2:  app.RentalDriveGo.com          — Company dashboard (private, subscription-gated)
 Layer 3:  {slug}.RentalDriveGo.com       — Company branded site (booking + payment here)
 Layer 4:  api.RentalDriveGo.com          — REST API
@@ -66,9 +66,9 @@ Layer 4:  api.RentalDriveGo.com          — REST API
 rental-car-site/
 ├── README.md
 ├── docs/
-│   ├── ARCHITECTURE.md       ← Payment providers, marketplace redirect model, photo flow
+│   ├── ARCHITECTURE.md       ← Payment providers, storefront redirect model, photo flow
 │   ├── DESIGN_SYSTEM.md
-│   ├── PAGES.md              ← All pages. Marketplace = discovery only. Booking = company site.
+│   ├── PAGES.md              ← All pages. Storefront = discovery only. Booking = company site.
 │   ├── FEATURES.md
 │   └── DEPLOYMENT.md
 └── skills/
@@ -80,7 +80,7 @@ rental-car-site/
     │       ├── api-routes.md           ← All routes
     │       ├── payment-service.md      ← AmanPay + PayPal implementation ← KEY FILE
     │       ├── subscription-service.md ← Manual renewal, plan prices in MAD/USD/EUR
-    │       ├── subdomain-service.md    ← Marketplace redirect + company site
+    │       ├── subdomain-service.md    ← Storefront redirect + company site
     │       └── notification-service.md ← All 5 channels
     └── rental-car-i18n/
 ```