feat: add csv exporter

src/content/market/csv-exporter.ts

@@ -0,0 +1,49 @@
+import { normalizeRateDisplay } from "../../shared/rate-normalizer";
+import { escapeCsvCell } from "../../shared/csv";
+import type { MarketRecord } from "./types";
+
+const CSV_COLUMNS = [
+  {
+    header: "达人ID",
+    readValue: (record: MarketRecord) => record.authorId
+  },
+  {
+    header: "达人名称",
+    readValue: (record: MarketRecord) => record.authorName
+  },
+  {
+    header: "地区",
+    readValue: (record: MarketRecord) => record.location ?? ""
+  },
+  {
+    header: "21-60s报价",
+    readValue: (record: MarketRecord) => record.price21To60s ?? ""
+  },
+  {
+    header: "单视频看后搜率",
+    readValue: (record: MarketRecord) =>
+      record.rates?.singleVideoAfterSearchRate
+        ? normalizeRateDisplay(record.rates.singleVideoAfterSearchRate)
+        : ""
+  },
+  {
+    header: "个人视频看后搜率",
+    readValue: (record: MarketRecord) =>
+      record.rates?.personalVideoAfterSearchRate
+        ? normalizeRateDisplay(record.rates.personalVideoAfterSearchRate)
+        : ""
+  },
+  {
+    header: "插件数据状态",
+    readValue: (record: MarketRecord) => record.status
+  }
+] as const;
+
+export function buildMarketCsv(records: MarketRecord[]): string {
+  const headerLine = CSV_COLUMNS.map((column) => column.header).join(",");
+  const rowLines = records.map((record) =>
+    CSV_COLUMNS.map((column) => escapeCsvCell(column.readValue(record))).join(",")
+  );
+
+  return [headerLine, ...rowLines].join("\n");
+}

src/shared/csv.ts

@@ -0,0 +1,7 @@
+export function escapeCsvCell(value: string): string {
+  if (/[",\n]/.test(value)) {
+    return `"${value.replace(/"/g, "\"\"")}"`;
+  }
+
+  return value;
+}