feat: complete PRD verification fixes and deployment readiness

- Add CommonModule to provide/export CampusScope across business modules
- Replace DepartmentsModule imports with CommonModule in 11 modules
- Add missing Class/Tenant repository imports to StudentsModule and SchedulesModule
- Fix service specs with CampusScope, ClassRepository, StudentRepository mocks
- Move better-sqlite3 to optionalDependencies for production Docker builds
- Rewrite Dockerfiles for monorepo root build context
- Update docker-compose.yml service build contexts

apps/server/package.json

@@ -34,7 +34,6 @@
     "@nestjs/typeorm": "^11.0.1",
     "@types/multer": "^2.1.0",
     "bcryptjs": "^3.0.3",
-    "better-sqlite3": "^12.9.0",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.15.1",
     "exceljs": "^4.4.0",
@@ -48,6 +47,9 @@
     "rxjs": "^7.8.1",
     "typeorm": "^0.3.28"
   },
+  "optionalDependencies": {
+    "better-sqlite3": "^12.9.0"
+  },
   "devDependencies": {
     "@eslint/eslintrc": "^3.2.0",
     "@eslint/js": "^9.18.0",