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

apps/api/src/modules/admin/admin.schemas.ts

@@ -1,5 +1,5 @@
 import { z } from 'zod'
-import type { MarketplaceHomepageContent, MarketplaceHomepageHowItWorksStep, MarketplaceHomepageMetric, MarketplaceHomepagePillar, MarketplaceHomepageSectionType, MarketplaceHomepageStep, MarketplaceHomepageTestimonial } from '@rentaldrivego/types'
+import type { StorefrontHomepageContent, StorefrontHomepageHowItWorksStep, StorefrontHomepageMetric, StorefrontHomepagePillar, StorefrontHomepageSectionType, StorefrontHomepageStep, StorefrontHomepageTestimonial } from '@rentaldrivego/types'
 
 export const loginSchema = z.object({
   email:     z.string().email().max(255).trim().toLowerCase(),
@@ -175,35 +175,35 @@ export const adminCompanyUpdateSchema = z.object({
   }).optional(),
 })
 
-const marketplaceMetricSchema:         z.ZodType<MarketplaceHomepageMetric>         = z.object({ value: z.string().min(1), label: z.string().min(1) })
-const marketplacePillarSchema:         z.ZodType<MarketplaceHomepagePillar>         = z.object({ title: z.string().min(1), body: z.string().min(1) })
-const marketplaceStepSchema:           z.ZodType<MarketplaceHomepageStep>           = z.object({ step: z.string().min(1), title: z.string().min(1), body: z.string().min(1) })
-const marketplaceHowItWorksStepSchema: z.ZodType<MarketplaceHomepageHowItWorksStep> = z.object({ number: z.string().min(1), title: z.string().min(1), description: z.string().min(1) })
-const marketplaceTestimonialSchema:    z.ZodType<MarketplaceHomepageTestimonial>     = z.object({ quote: z.string().min(1), author: z.string().min(1), role: z.string().min(1), company: z.string().optional() })
-const marketplaceSectionSchema: z.ZodType<MarketplaceHomepageSectionType>  = z.enum(['hero', 'surface', 'pillars', 'audiences', 'features', 'howitworks', 'steps', 'testimonials', 'closing'])
+const storefrontMetricSchema:         z.ZodType<StorefrontHomepageMetric>         = z.object({ value: z.string().min(1), label: z.string().min(1) })
+const storefrontPillarSchema:         z.ZodType<StorefrontHomepagePillar>         = z.object({ title: z.string().min(1), body: z.string().min(1) })
+const storefrontStepSchema:           z.ZodType<StorefrontHomepageStep>           = z.object({ step: z.string().min(1), title: z.string().min(1), body: z.string().min(1) })
+const storefrontHowItWorksStepSchema: z.ZodType<StorefrontHomepageHowItWorksStep> = z.object({ number: z.string().min(1), title: z.string().min(1), description: z.string().min(1) })
+const storefrontTestimonialSchema:    z.ZodType<StorefrontHomepageTestimonial>     = z.object({ quote: z.string().min(1), author: z.string().min(1), role: z.string().min(1), company: z.string().optional() })
+const storefrontSectionSchema: z.ZodType<StorefrontHomepageSectionType>  = z.enum(['hero', 'surface', 'pillars', 'audiences', 'features', 'howitworks', 'steps', 'testimonials', 'closing'])
 
-const marketplaceHomepageContentSchema: z.ZodType<MarketplaceHomepageContent> = z.object({
-  sections: z.array(marketplaceSectionSchema).min(1),
+const storefrontHomepageContentSchema: z.ZodType<StorefrontHomepageContent> = z.object({
+  sections: z.array(storefrontSectionSchema).min(1),
   heroKicker: z.string().min(1), heroTitle: z.string().min(1), heroBody: z.string().min(1),
   startTrial: z.string().min(1), exploreVehicles: z.string().min(1),
   surfaceLabel: z.string().min(1), surfaceTitle: z.string().min(1), surfaceBody: z.string().min(1),
   liveLabel: z.string().min(1), trustedFleets: z.string().min(1), brandedFlows: z.string().min(1), multiTenant: z.string().min(1),
   companyKicker: z.string().min(1), companyTitle: z.string().min(1), companyBody: z.string().min(1),
   renterKicker: z.string().min(1), renterTitle: z.string().min(1), renterBody: z.string().min(1),
-  pillars: z.array(marketplacePillarSchema).length(3),
-  metrics: z.array(marketplaceMetricSchema).length(3),
+  pillars: z.array(storefrontPillarSchema).length(3),
+  metrics: z.array(storefrontMetricSchema).length(3),
   featureLabel: z.string().min(1), features: z.array(z.string().min(1)).min(1),
-  howitworksKicker: z.string().min(1), howitworksTitle: z.string().min(1), howitworksSteps: z.array(marketplaceHowItWorksStepSchema).min(1),
-  stepsTitle: z.string().min(1), steps: z.array(marketplaceStepSchema).length(3), stepLabel: z.string().min(1),
-  testimonialsKicker: z.string().min(1), testimonialsTitle: z.string().min(1), testimonials: z.array(marketplaceTestimonialSchema).min(1),
+  howitworksKicker: z.string().min(1), howitworksTitle: z.string().min(1), howitworksSteps: z.array(storefrontHowItWorksStepSchema).min(1),
+  stepsTitle: z.string().min(1), steps: z.array(storefrontStepSchema).length(3), stepLabel: z.string().min(1),
+  testimonialsKicker: z.string().min(1), testimonialsTitle: z.string().min(1), testimonials: z.array(storefrontTestimonialSchema).min(1),
   readyKicker: z.string().min(1), readyTitle: z.string().min(1), readyBody: z.string().min(1),
   viewPricing: z.string().min(1), createWorkspace: z.string().min(1),
 })
 
-export const marketplaceHomepageConfigSchema = z.object({
-  en: marketplaceHomepageContentSchema,
-  fr: marketplaceHomepageContentSchema,
-  ar: marketplaceHomepageContentSchema,
+export const storefrontHomepageConfigSchema = z.object({
+  en: storefrontHomepageContentSchema,
+  fr: storefrontHomepageContentSchema,
+  ar: storefrontHomepageContentSchema,
 })
 
 export const idParamSchema = z.object({
@@ -300,7 +300,7 @@ export const billingRefundSchema = z.object({
 })
 
 export const homepageUpdateSchema = z.object({
-  homepage: marketplaceHomepageConfigSchema,
+  homepage: storefrontHomepageConfigSchema,
 })
 
 export const pricingUpdateSchema = z.object({