Add Gmail+Email Worker hybrid mail path and private runtime config

Prefer Cloudflare Worker KV for verification codes with optional short IMAP
fallback disabled for private deploy; track config.json/.env for private repo.
Also add worker project, protocol mint backoff, and fail-fast Turnstile/mail
timeouts from batch runs.

auto_register.py

@@ -182,13 +182,41 @@ def save_account(email: str, password: str, sso: str = ""):
         f.write(f"{email}----{password}----{sso}\n")
     print(f"[+] Saved: {email}")
 
+def resolve_browser_path() -> str | None:
+    # Prefer Chromium: Google Chrome blocks --load-extension (turnstilePatch).
+    for cand in (
+        "/snap/bin/chromium",
+        "/usr/bin/chromium",
+        "/usr/bin/chromium-browser",
+        "/usr/bin/google-chrome",
+        "/usr/bin/google-chrome-stable",
+    ):
+        if os.path.isfile(cand) or os.path.islink(cand):
+            return cand
+    return None
+
+
 def create_browser_options(headless: bool = False, proxy: str = "") -> ChromiumOptions:
     opts = ChromiumOptions()
     opts.auto_port()
     for flag in CHROMIUM_SLIM_FLAGS:
         opts.set_argument(flag)
+    browser_path = resolve_browser_path()
+    if browser_path:
+        try:
+            opts.set_browser_path(browser_path)
+        except Exception:
+            pass
     if os.path.exists(EXTENSION_PATH):
-        opts.add_extension(EXTENSION_PATH)
+        is_chrome = bool(
+            browser_path
+            and "chrome" in os.path.basename(browser_path)
+            and "chromium" not in browser_path
+        )
+        if is_chrome:
+            print("[!] skip turnstilePatch: Google Chrome disallows --load-extension; use Chromium")
+        else:
+            opts.add_extension(EXTENSION_PATH)
     if headless:
         opts.headless()
     if proxy: