rebrand: agent-browser-stealth → chrome-use, de-fork, reset to v1.0.0

Standalone product rename across the whole repo (issue: project identity):

- Binary/package/repo/skill/docs: agent-browser[-stealth] → chrome-use
  (single binary name `chrome-use`; old aliases agent-browser/abs dropped).
- Version: 0.27.0-fork.51 → 1.0.0 (drop the upstream-fork counter).
- Native-messaging host: com.agent_browser.connect → com.leeguoo.chrome_use
  (CLI + ab-connect extension in lockstep — this is a breaking handshake change,
  extension bumped 0.4.2 → 0.5.0, needs a Web Store republish).
- Config dir: ~/.agent-browser → ~/.chrome-use.
- README/zh: reframed from "stealth fork of agent-browser" to a standalone
  product with a small `originally based on vercel-labs/agent-browser` credit.
- Kept AGENT_BROWSER_* env vars working (63 vars across the codebase; renaming
  them would break every existing script/skill for no user-facing gain).

Build green, 802 unit tests pass, fmt + clippy clean. Upstream attribution to
vercel-labs/agent-browser preserved.

extensions/tab-group-cdp/service-worker.js

@@ -26,7 +26,7 @@ const CONTENT_GET_DOM_STATE = 'AB_CONTENT_GET_DOM_STATE';
 const CONTENT_PING = 'AB_CONTENT_PING';
 
 const DEFAULT_GROUP_TITLE = 'Agent Browser Stealth';
-const DOWNLOAD_ARCHIVE_ROOT = 'agent-browser-stealth';
+const DOWNLOAD_ARCHIVE_ROOT = 'chrome-use';
 const STORAGE_POLICY_KEY = 'abSessionPoliciesV1';
 const STORAGE_OPTIONS_KEY = 'abExtensionOptionsV1';
 const STORAGE_WORKFLOWS_KEY = 'abWorkflowsV1';
@@ -932,7 +932,7 @@ async function enforceSessionWindowAffinity(tabId) {
 
 async function updateRiskBadge(tabId) {
   let text = '';
-  let title = 'agent-browser-stealth';
+  let title = 'chrome-use';
 
   const session = getManagedSessionForTab(tabId);
   if (session) {