Migrate exchange backend from Django to Express + Apollo Server + Prisma

Replace Python/Django/Graphene with TypeScript/Express/Apollo Server.
Same 4 endpoints (public/user/team/m2m), same JWT auth.
Prisma replaces Django ORM for Offer/Request/SupplierProfile.
Temporal and Odoo integrations preserved.

prisma/schema.prisma

@@ -0,0 +1,71 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("EXCHANGE_DATABASE_URL")
+}
+
+model Offer {
+  id               Int       @id @default(autoincrement())
+  uuid             String    @unique @default(uuid())
+  teamUuid         String    @map("team_uuid") @db.VarChar(100)
+  status           String    @default("active") @db.VarChar(20)
+  workflowStatus   String    @default("pending") @map("workflow_status") @db.VarChar(20)
+  workflowError    String?   @map("workflow_error")
+  locationUuid     String?   @map("location_uuid") @db.VarChar(100)
+  locationName     String    @default("") @map("location_name") @db.VarChar(255)
+  locationCountry  String    @default("") @map("location_country") @db.VarChar(100)
+  locationCountryCode String @default("") @map("location_country_code") @db.VarChar(10)
+  locationLatitude  Float?   @map("location_latitude")
+  locationLongitude Float?   @map("location_longitude")
+  productUuid      String    @map("product_uuid") @db.VarChar(100)
+  productName      String    @map("product_name") @db.VarChar(255)
+  categoryName     String    @default("") @map("category_name") @db.VarChar(255)
+  quantity         Decimal   @db.Decimal(12, 2)
+  unit             String    @default("ton") @db.VarChar(20)
+  pricePerUnit     Decimal   @map("price_per_unit") @db.Decimal(12, 2)
+  currency         String    @default("USD") @db.VarChar(10)
+  terminusSchemaId String?   @map("terminus_schema_id") @db.VarChar(255)
+  terminusDocumentId String? @map("terminus_document_id") @db.VarChar(255)
+  description      String?
+  validUntil       DateTime? @map("valid_until") @db.Date
+  createdAt        DateTime  @default(now()) @map("created_at")
+  updatedAt        DateTime  @updatedAt @map("updated_at")
+
+  @@map("offers")
+}
+
+model Request {
+  id                 Int      @id @default(autoincrement())
+  uuid               String   @unique @default(uuid())
+  productUuid        String   @map("product_uuid") @db.VarChar(100)
+  quantity           Decimal  @db.Decimal(12, 2)
+  sourceLocationUuid String   @map("source_location_uuid") @db.VarChar(100)
+  userId             String   @map("user_id") @db.VarChar(255)
+  createdAt          DateTime @default(now()) @map("created_at")
+  updatedAt          DateTime @updatedAt @map("updated_at")
+
+  @@map("calculations")
+}
+
+model SupplierProfile {
+  id             Int      @id @default(autoincrement())
+  uuid           String   @unique @default(uuid())
+  teamUuid       String   @unique @map("team_uuid") @db.VarChar(100)
+  kycProfileUuid String?  @map("kyc_profile_uuid") @db.VarChar(100)
+  name           String   @db.VarChar(255)
+  description    String?
+  country        String   @default("") @db.VarChar(100)
+  countryCode    String   @default("") @map("country_code") @db.VarChar(10)
+  logoUrl        String?  @map("logo_url") @db.VarChar(500)
+  latitude       Float?
+  longitude      Float?
+  isVerified     Boolean  @default(false) @map("is_verified")
+  isActive       Boolean  @default(true) @map("is_active")
+  createdAt      DateTime @default(now()) @map("created_at")
+  updatedAt      DateTime @updatedAt @map("updated_at")
+
+  @@map("suppliers")
+}