feat: Phase 0 — monorepo 骨架 + 全表迁移 + FastAPI/Next 骨架 + CI

- uv(workspace) + pnpm monorepo；docker-compose(pg+api+web)
- SQLAlchemy 16 MVP 表 + Alembic 初版迁移(无漂移，users stub)
- FastAPI 骨架：统一错误信封(带 request_id) + structlog + /jobs/:id + OpenAPI
- Next.js 骨架：纸感主题 token + OpenAPI→TS 客户端代码生成(gen:api)
- CI(ruff/mypy/pytest + pg service + alembic 漂移校验)
- 四份设计规格(PRODUCT/UX/ARCHITECTURE/DEV_PLAN) + CLAUDE.md

apps/web/tailwind.config.ts

@@ -0,0 +1,32 @@
+import type { Config } from "tailwindcss";
+
+// 纸感·文学温暖主题（UX_SPEC §2）。颜色经 CSS 变量落地，便于后续夜读模式切换。
+const config: Config = {
+  content: ["./app/**/*.{ts,tsx}", "./components/**/*.{ts,tsx}"],
+  theme: {
+    extend: {
+      colors: {
+        bg: "var(--color-bg)",
+        panel: "var(--color-panel)",
+        ink: "var(--color-ink)",
+        "ink-soft": "var(--color-ink-soft)",
+        line: "var(--color-line)",
+        cinnabar: "var(--color-cinnabar)",
+        conflict: "var(--color-conflict)",
+        overdue: "var(--color-overdue)",
+        pass: "var(--color-pass)",
+        info: "var(--color-info)",
+      },
+      fontFamily: {
+        serif: ['"Noto Serif SC"', '"Songti SC"', "serif"],
+        sans: ['"Noto Sans SC"', '"PingFang SC"', "system-ui", "sans-serif"],
+        mono: ['"JetBrains Mono"', "ui-monospace"],
+      },
+      borderRadius: { DEFAULT: "6px" },
+      boxShadow: { paper: "0 1px 3px #2B26200F" },
+      maxWidth: { prose: "720px" },
+    },
+  },
+  plugins: [],
+};
+export default config;