docs: add links section, fix download badges, post-download CTAs

- Add Links section to both READMEs (website, issues, PyPI, npm, email)
- Replace broken pepy.tech badge with shields.io PyPI + npm download badges
- Post-download messages: website, issues link, star CTA (Python + JS)
- Fix CLOAKBROWSER_DOWNLOAD_URL default in docs (github → cloakbrowser.dev)
- Fix tests: download URL assertions, platform-aware stealth args test

js/tests/update.test.ts

@@ -37,7 +37,7 @@ describe("version comparison", () => {
 describe("download URL", () => {
   it("uses chromium-v prefix and cloakbrowser repo", () => {
     const url = getDownloadUrl();
-    expect(url).toContain("github.com/CloakHQ/cloakbrowser/releases/download");
+    expect(url).toContain("cloakbrowser.dev");
     expect(url).toContain(`chromium-v${CHROMIUM_VERSION}`);
     expect(url.endsWith(".tar.gz")).toBe(true);
   });