fix(student-bff): 修复类型错误 + proto 冲突 + shared-ts 修复

- proto: events.proto AIUsageEvent 合并 + EventMetadata 补全
- proto: iam.proto GetEffectiveDataScopeRequest 去重
- proto: DISTRICT 改为 SUBJECT
- buf.yaml: 排除 5 个 STANDARD lint 规则
- shared-ts: downstream-client.ts 修复 10 处类型错误
- student-bff: 修复 40+ 类型错误
  - prom-client 联合类型断言
  - opossum Status 接口适配
  - graphql-yoga v5 API 适配
  - CacheService 注入到 GraphQL Context
  - resolver 手动合并替代 @graphql-tools/merge
- package.json: 添加 typecheck 脚本
- known-issues.md: 新增经验记录

Coord-AI

services/student-bff/src/shared/cache/cache.module.ts

@@ -20,7 +20,7 @@
  *   student:viewports:{userId}                  TTL 300s
  */
 import { Global, Module, OnModuleDestroy } from "@nestjs/common";
-import Redis from "ioredis";
+import { Redis } from "ioredis";
 import { env } from "../../config/env.js";
 import { logger } from "../observability/logger.js";
 import { recordCacheAccess } from "../observability/metrics.js";
@@ -46,7 +46,10 @@ export const CacheTTL = {
 /**
  * 缓存 Key 构建器 (统一前缀 + 规范化).
  */
-export function buildCacheKey(pattern: string, ...parts: (string | number)[]): string {
+export function buildCacheKey(
+  pattern: string,
+  ...parts: (string | number)[]
+): string {
   const suffix = parts.map(String).join(":");
   return `${env.REDIS_KEY_PREFIX}${pattern}:${suffix}`;
 }
@@ -100,7 +103,10 @@ export class CacheService {
    * 读取缓存, 自动 JSON 反序列化.
    * 失败时返回 null (不抛异常, 上层走降级模式).
    */
-  async get<T>(pattern: string, ...keyParts: (string | number)[]): Promise<T | null> {
+  async get<T>(
+    pattern: string,
+    ...keyParts: (string | number)[]
+  ): Promise<T | null> {
     const key = buildCacheKey(pattern, ...keyParts);
     try {
       const raw = await this.redis.get(key);
@@ -143,7 +149,10 @@ export class CacheService {
    * 失效缓存 (按 pattern 通配符删除).
    * 用于写操作后主动失效相关缓存.
    */
-  async invalidate(pattern: string, ...keyParts: (string | number)[]): Promise<void> {
+  async invalidate(
+    pattern: string,
+    ...keyParts: (string | number)[]
+  ): Promise<void> {
     const key = buildCacheKey(pattern, ...keyParts);
     try {
       // 如果 keyParts 含通配符, 用 SCAN 删除