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.

cli/src/native/screenshot.rs

@@ -260,7 +260,7 @@ async fn collect_annotations(
                 "DOM.resolveNode",
                 Some(serde_json::json!({
                     "backendNodeId": backend_node_id,
-                    "objectGroup": "agent-browser-annotate"
+                    "objectGroup": "chrome-use-annotate"
                 })),
                 Some(session_id),
             )
@@ -589,11 +589,9 @@ fn round(value: f64) -> i64 {
 
 fn get_screenshot_dir() -> PathBuf {
     if let Some(home) = dirs::home_dir() {
-        home.join(".agent-browser").join("tmp").join("screenshots")
+        home.join(".chrome-use").join("tmp").join("screenshots")
     } else {
-        std::env::temp_dir()
-            .join("agent-browser")
-            .join("screenshots")
+        std::env::temp_dir().join("chrome-use").join("screenshots")
     }
 }