perf: tune selfbot runtime defaults

Apply low-memory client options and point the workspace vendor package at the optimized selfbot internals for more stable long-running moderation capture.

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

tests/vendor/requestHandlerBackoff.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from "vitest";
+
+const { calculateRetryDelay } = await import(
+  "../../vendor/discord.js-selfbot-v13/src/rest/RequestHandler.js"
+);
+
+describe("calculateRetryDelay", () => {
+  it("increases exponentially and applies bounded jitter", () => {
+    expect(calculateRetryDelay(1, () => 0)).toBe(250);
+    expect(calculateRetryDelay(2, () => 0)).toBe(500);
+    expect(calculateRetryDelay(3, () => 0)).toBe(1000);
+    expect(calculateRetryDelay(10, () => 0)).toBe(5000);
+    expect(calculateRetryDelay(1, () => 0.999)).toBe(499);
+  });
+});