feat(seed): split seed scripts into production and development

- Create seed.production.js with admin user, divisions, and competition types only
- Rename seed.js to seed.development.js with all test data
- Add admin@spotlight.cam account with isAdmin flag and COMFORT tier
- Update test users to use @spotlight.cam domain and SUPPORTER tier
- Remove wsdcId from test users
- Add npm scripts: prisma:seed:dev and prisma:seed:prod
- Add Makefile targets: seed-dev and seed-prod

backend/package.json

@@ -10,7 +10,9 @@
     "test:watch": "jest --watch",
     "prisma:generate": "prisma generate",
     "prisma:migrate": "prisma migrate dev",
-    "prisma:seed": "node prisma/seed.js",
+    "prisma:seed": "node prisma/seed.development.js",
+    "prisma:seed:dev": "node prisma/seed.development.js",
+    "prisma:seed:prod": "node prisma/seed.production.js",
     "prisma:studio": "prisma studio",
     "cli": "node src/cli/index.js"
   },
@@ -65,7 +67,7 @@
     }
   },
   "prisma": {
-    "seed": "node prisma/seed.js"
+    "seed": "node prisma/seed.development.js"
   },
   "overrides": {
     "csurf": {