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/ab-connect/popup.html

@@ -90,7 +90,7 @@
   <header>
     <img src="icons/icon128.png" alt="" />
     <div>
-      <div class="title">agent-browser-stealth</div>
+      <div class="title">chrome-use</div>
       <div class="ver">local automation bridge</div>
     </div>
   </header>
@@ -105,20 +105,20 @@
     </div>
 
     <p class="desc">
-      Lets your locally-installed <strong>agent-browser</strong> command-line tool
+      Lets your locally-installed <strong>chrome-use</strong> command-line tool
       drive your own logged-in Chrome tabs — entirely on this machine, only when
       you run a command. No remote server, no data collection.
     </p>
 
     <div class="hint" id="hint">
       Not linked yet. Install &amp; pair the CLI, then reopen this popup:
-      <code>agent-browser extension install</code>
+      <code>chrome-use extension install</code>
     </div>
   </main>
 
   <footer>
     <span class="privacy">No tracking · no remote server</span>
-    <a id="repo" data-href="https://github.com/leeguooooo/agent-browser-stealth">GitHub ↗</a>
+    <a id="repo" data-href="https://github.com/leeguooooo/chrome-use">GitHub ↗</a>
   </footer>
 
   <script src="popup.js"></script>