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/frontend_redesign_plan.md

@@ -44,7 +44,7 @@
 
 ## 3. What to Redesign (Inspired by isysolution.com)
 
-### 3.1 Marketplace — Public Pages
+### 3.1 Storefront — Public Pages
 
 #### Home Page (`/`)
 Current issues to fix:
@@ -70,7 +70,7 @@ Stats Strip
 How It Works
   ├── Step 1: Create your workspace
   ├── Step 2: Add your fleet
-  ├── Step 3: Go live on marketplace
+  ├── Step 3: Go live on storefront
   └── Step 4: Manage everything from dashboard
 
 Services / Features Grid
@@ -154,8 +154,8 @@ Redesign:
 ## 4. Component Redesign Checklist
 
 ### Shared Components
-- [ ] `MarketplaceHeader` — add mobile hamburger menu, improve nav spacing
-- [ ] `MarketplaceFooter` — add logo, social links, newsletter input
+- [ ] `StorefrontHeader` — add mobile hamburger menu, improve nav spacing
+- [ ] `StorefrontFooter` — add logo, social links, newsletter input
 - [ ] `BookingForm` — improve step layout, add progress indicator
 - [ ] `WorkspaceTabs` — improve active tab styling
 
@@ -187,7 +187,7 @@ Redesign:
 | Numbered step process | Home "How it works" |
 | Stats/counters strip | Home page |
 | Testimonials carousel | Home page |
-| Mega footer with columns | Marketplace footer |
+| Mega footer with columns | Storefront footer |
 | Sidebar with grouped nav | Dashboard |
 | KPI metric cards | Dashboard home |
 
@@ -202,7 +202,7 @@ Redesign:
 - Wide: `xl: 1280px`, `2xl: 1536px`
 
 ### Mobile Improvements Needed
-- [ ] Hamburger menu for marketplace header
+- [ ] Hamburger menu for storefront header
 - [ ] Collapsible sidebar for dashboard
 - [ ] Stack pricing cards vertically
 - [ ] Full-width booking form
@@ -228,7 +228,7 @@ Redesign:
 
 ## 8. Implementation Phases
 
-### Phase 1 — Marketplace Public Pages (Priority)
+### Phase 1 — Storefront Public Pages (Priority)
 1. Home page redesign
    - Stats strip
    - How it works section
@@ -254,15 +254,15 @@ Redesign:
 
 ## 9. Files to Modify
 
-### Marketplace
+### Storefront
 | File | Change |
 |---|---|
 | `src/app/(public)/HomeContent.tsx` | Add stats, how-it-works, testimonials sections |
 | `src/app/(public)/features/page.tsx` | Alternating layout |
 | `src/app/(public)/pricing/PricingPageContent.tsx` | Toggle + improved cards |
 | `src/app/(public)/explore/ExploreVehicleGrid.tsx` | Improved vehicle cards |
-| `src/components/MarketplaceHeader.tsx` | Mobile menu |
-| `src/components/MarketplaceFooter.tsx` | Mega footer |
+| `src/components/StorefrontHeader.tsx` | Mobile menu |
+| `src/components/StorefrontFooter.tsx` | Mega footer |
 | `src/app/globals.css` | No changes needed |
 
 ### Dashboard