feat: add map-password API with DB model and admin endpoint

prisma/schema.prisma

@@ -280,3 +280,31 @@ model DeviceBinding {
   @@unique([userId, installId])
   @@map("device_bindings")
 }
+
+// ============================================
+// 地图密码批次表
+// ============================================
+model MapPassword {
+  id          String    @id @default(uuid())
+  createdAt   DateTime  @default(now()) @map("created_at")
+  
+  maps        MapPasswordItem[]
+
+  @@map("map_passwords")
+}
+
+// ============================================
+// 地图密码明细表
+// ============================================
+model MapPasswordItem {
+  id            String    @id @default(uuid())
+  batchId       String    @map("batch_id")
+  mapName       String    @map("map_name") @db.VarChar(50)
+  password      String    @db.VarChar(20)
+  location      String    @db.Text
+  image         String    @db.VarChar(500)
+  
+  batch         MapPassword @relation(fields: [batchId], references: [id], onDelete: Cascade)
+
+  @@map("map_password_items")
+}