feat: vendor Discord video stream workspace

Add Discord-video-stream as a vendored workspace dependency and wire it to use the local selfbot package for development.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/vendor/videoStreamWorkspaceDependency.test.ts

@@ -0,0 +1,20 @@
+import { readFileSync } from "node:fs";
+import { describe, expect, it } from "vitest";
+
+const videoStreamPackage = JSON.parse(
+  readFileSync("vendor/Discord-video-stream/package.json", "utf8"),
+) as {
+  devDependencies?: Record<string, string>;
+  peerDependencies?: Record<string, string>;
+};
+
+describe("Discord video stream workspace dependencies", () => {
+  it("uses the local selfbot workspace package for development", () => {
+    expect(videoStreamPackage.devDependencies?.["discord.js-selfbot-v13"]).toBe(
+      "workspace:*",
+    );
+    expect(videoStreamPackage.peerDependencies?.["discord.js-selfbot-v13"]).toBe(
+      "^3.6.0",
+    );
+  });
+});