docs(engineering): add project audit report and improvement plan

This commit introduces a comprehensive engineering audit report for the Tootaio Studio project. The report is structured into documents covering architecture, code quality, performance, security, CI/CD, and
observability. It also includes a phased improvement roadmap and a set of `.patch` files to apply immediate fixes for content schemas, package scripts, and CI configuration.

docs/20251106/observability.md

@@ -0,0 +1,40 @@
+# 监控、日志与可观测性
+
+## 目标
+构建可追踪错误、性能瓶颈与用户关键路径的最小监控闭环。
+
+## Sentry（推荐）
+1) 配置 `runtimeConfig.sentryDsn`；
+2) 插件（示例，待引入依赖后启用）：
+```ts
+// plugins/sentry.client.ts
+export default defineNuxtPlugin(() => {
+  const { public: pub, sentryDsn } = useRuntimeConfig()
+  if (!sentryDsn) return
+  // @ts-ignore: add SDK in deps later
+  const Sentry = (window as any).Sentry
+  if (Sentry) {
+    Sentry.init({ dsn: sentryDsn, tracesSampleRate: 0.1 })
+  }
+})
+```
+
+## 日志与错误边界
+- 服务器：使用 Nitro 默认日志（生产应接入集中式日志，如 CloudWatch/ELK）。
+- 客户端：全局错误捕获（`app:error` 事件）上报到 Sentry/自建网关。
+
+## Web Vitals（可选）
+收集 LCP/CLS/INP 等指标（示例）：
+```ts
+// plugins/web-vitals.client.ts
+import { onCLS, onINP, onLCP } from 'web-vitals'
+export default defineNuxtPlugin(() => {
+  const send = (metric: any) => navigator.sendBeacon('/vitals', JSON.stringify(metric))
+  onLCP(send); onCLS(send); onINP(send)
+})
+```
+
+## Dashboard 路线
+- 第一步：仅错误计数与关键事务。
+- 第二步：接口慢查询、资源错误分布、版本追踪（commit SHA）。
+