feat(p1): complete P1 foundation stage

- monorepo: pnpm workspace + go.work + pyproject.toml + commitlint/husky
- infra: docker-compose (minimal + full profiles) + init-sql + prometheus
- arch-scan: multi-language scanner skeleton (TS/Go/Python/Proto)
- shared-proto: buf v2 + classes.proto (ClassService CRUD contract)
- api-gateway: Go/Gin + JWT HS256 auth + reverse proxy + request ID
- classes: NestJS golden template (error system + observability + middleware + CRUD + tests)
- teacher-portal: Next.js + paper-feel UI design system
- CI/CD: 4 workflows (go/ts/py/proto)
- docs: migration guide + project_rules + coding-standards + git-workflow + ui-design-system + 004 + 9 module READMEs + known-issues + spec/plan migration + roadmap

apps/teacher-portal/src/app/globals.css

@@ -0,0 +1,43 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+:root {
+  --bg-paper: hsl(40, 20%, 98%);
+  --color-ink: hsl(25, 3%, 15%);
+  --color-ink-muted: hsl(30, 5%, 45%);
+  --color-accent: hsl(220, 60%, 35%);
+  --color-rule: hsl(30, 10%, 90%);
+  --font-serif: 'Fraunces', Georgia, serif;
+  --font-sans: 'Inter', system-ui, sans-serif;
+  --font-mono: 'JetBrains Mono', monospace;
+}
+
+html, body {
+  background: var(--bg-paper);
+  color: var(--color-ink);
+  font-family: var(--font-sans);
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+h1, h2, h3, h4, h5, h6 {
+  font-family: var(--font-serif);
+  font-weight: 600;
+  letter-spacing: -0.01em;
+}
+
+/* 纸感分隔线 */
+.rule {
+  border-top: 1px solid var(--color-rule);
+}
+
+.rule-thin {
+  border-top: 2px solid var(--color-rule);
+}
+
+/* 左侧竖线标记（节点展开样式）*/
+.mark-left {
+  border-left: 2px solid var(--color-rule);
+  padding-left: 12px;
+}