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/Dockerfile

@@ -1,14 +1,16 @@
 FROM node:22-alpine AS builder
 WORKDIR /app
 COPY package*.json ./
-RUN npm ci
+COPY apps/server/package.json ./apps/server/package.json
+COPY packages/typescript-config/package.json ./packages/typescript-config/package.json
+RUN npm ci --no-optional
 COPY . .
-RUN npm run build
+RUN npm run build -w @gongxue/server
 
 FROM node:22-alpine
 WORKDIR /app
-COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/apps/server/dist ./dist
+COPY --from=builder /app/apps/server/package.json ./
 COPY --from=builder /app/node_modules ./node_modules
-COPY --from=builder /app/package.json ./
 EXPOSE 3000
 CMD ["node", "dist/main.js"]