add video; update dedup script

docs/index.md

@@ -9,6 +9,7 @@ hero:
 
 <Downloader />
 
+- [东非最发达的城市现在怎么样了？揭秘肯尼亚不为人知的一面](./东非最发达的城市现在怎么样了？揭秘肯尼亚不为人知的一面.md)
 - [一次性搞清楚北方四岛 ｜ 毛泽东日本代表团谈话 ｜ 中苏交恶](./一次性搞清楚北方四岛_｜_毛泽东日本代表团谈话_｜_中苏交恶.md)
 - [对非零关税：补齐中国资源短板，带动中非共同发展](./对非零关税：补齐中国资源短板，带动中非共同发展.md)
 - [馬來西亞為何力挺伊朗？當宗教之外的現實利益，讓遜尼派國家站在什葉派這邊](./馬來西亞為何力挺伊朗？當宗教之外的現實利益，讓遜尼派國家站在什葉派這邊.md)

group-similar.js

@@ -25,6 +25,7 @@
 import { readFileSync, writeFileSync } from "node:fs";
 import { resolve, dirname } from "node:path";
 import { fileURLToPath } from "node:url";
+import matter from "gray-matter";
 // @ts-ignore - sharp ships no bundled .d.ts; types are not needed at runtime
 import sharp from "sharp";
 
@@ -267,17 +268,22 @@ export async function renderFile(inputPath, outputPath, threshold = 0.005) {
   const baseDir = dirname(resolvedInput);
 
   console.log(`Reading   : ${resolvedInput}`);
-  console.log(`Threshold : ${threshold}`);
 
-  const raw = readFileSync(resolvedInput, "utf8");
+  const { data, content: raw } = matter(readFileSync(resolvedInput, "utf8"));
   const lines = raw.split("\n").map(parseLine);
 
+  threshold =
+    typeof data["dedup"] === "number" && data["dedup"] > 0
+      ? data["dedup"]
+      : threshold;
+  console.log(`Threshold : ${threshold}`);
+
   /** @type {Stats} */
   const stats = { comparisons: 0, grouped: 0 };
   const grouped = await groupImages(lines, baseDir, threshold, stats);
   const output = render(grouped);
 
-  writeFileSync(resolvedOutput, output, "utf8");
+  writeFileSync(resolvedOutput, matter.stringify(output, data), "utf8");
 
   console.log(
     `Comparisons: ${stats.comparisons}  |  grouped: ${stats.grouped}`,