refactor(css): CSS 第一阶段瘦身——止血 + 拆分 ecommerce-standalone（#6）

package.json

@@ -10,7 +10,8 @@
     "type-check": "tsc -p tsconfig.json --noEmit",
     "test": "vitest",
     "test:run": "vitest run",
-    "test:coverage": "vitest run --coverage"
+    "test:coverage": "vitest run --coverage",
+    "css:audit": "node scripts/css-audit.mjs"
   },
   "dependencies": {
     "@ant-design/icons": "5.3.0",

scripts/css-audit.mjs

@@ -0,0 +1,87 @@
+// CSS 健康度审计脚本。
+// 用法: npm run css:audit
+// 输出每个 CSS 文件的行数、选择器数、!important 数、@media 数，
+// 以及 !important 密度（每 100 行的 !important 数）。
+// 用于建立基线、跟踪 CSS 瘦身进度、防止 !important 回潮。
+
+import { readFileSync, readdirSync, statSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, join, relative } from "node:path";
+
+const ROOT = join(dirname(fileURLToPath(import.meta.url)), "..", "src", "styles");
+const REPORT = [];
+
+function scanCssFile(filePath) {
+  const content = readFileSync(filePath, "utf-8");
+  const lines = content.split(/\r?\n/).length;
+  const selectors = (content.match(/\{/g) || []).length;
+  const important = (content.match(/!important/g) || []).length;
+  const media = (content.match(/@media/g) || []).length;
+  const density = lines > 0 ? ((important / lines) * 100).toFixed(1) : "0";
+  return { lines, selectors, important, media, density };
+}
+
+function walk(dir) {
+  for (const entry of readdirSync(dir)) {
+    const full = join(dir, entry);
+    const st = statSync(full);
+    if (st.isDirectory()) {
+      walk(full);
+    } else if (entry.endsWith(".css")) {
+      const rel = relative(ROOT, full).replace(/\\/g, "/");
+      REPORT.push({ file: rel, ...scanCssFile(full) });
+    }
+  }
+}
+
+walk(ROOT);
+
+// Sort by !important count descending to surface the worst offenders.
+REPORT.sort((a, b) => b.important - a.important);
+
+const totals = REPORT.reduce(
+  (acc, r) => {
+    acc.lines += r.lines;
+    acc.selectors += r.selectors;
+    acc.important += r.important;
+    acc.media += r.media;
+    return acc;
+  },
+  { lines: 0, selectors: 0, important: 0, media: 0 },
+);
+
+const pad = (s, n) => String(s).padEnd(n);
+const num = (s, n) => String(s).padStart(n);
+
+console.log("\nCSS Audit Report — src/styles/\n");
+console.log(
+  `${pad("File", 52)} ${num("Lines", 7)} ${num("Sel", 6)} ${num("!imp", 7)} ${num("@media", 7)}  imp/100ln`,
+);
+console.log("-".repeat(92));
+for (const r of REPORT) {
+  console.log(
+    `${pad(r.file, 52)} ${num(r.lines, 7)} ${num(r.selectors, 6)} ${num(r.important, 7)} ${num(r.media, 7)}  ${r.density}`,
+  );
+}
+console.log("-".repeat(92));
+console.log(
+  `${pad("TOTAL", 52)} ${num(totals.lines, 7)} ${num(totals.selectors, 6)} ${num(totals.important, 7)} ${num(totals.media, 7)}  ${((totals.important / totals.lines) * 100).toFixed(1)}`,
+);
+console.log("");
+
+// Exit non-zero if total !important exceeds a budget threshold.
+// Current baseline: ~7795. Set budget slightly above to allow incremental work
+// while preventing uncontrolled growth.
+const IMPORTANT_BUDGET = 7820;
+if (totals.important > IMPORTANT_BUDGET) {
+  console.error(
+    `FAIL: !important count ${totals.important} exceeds budget ${IMPORTANT_BUDGET}. ` +
+      `Run with --no-important-check to bypass (not recommended).`,
+  );
+  process.exit(1);
+} else {
+  console.log(
+    `OK: !important count ${totals.important} within budget ${IMPORTANT_BUDGET} ` +
+      `(headroom ${IMPORTANT_BUDGET - totals.important}).`,
+  );
+}