revert(web): remove keyless Parallel search fallback (#46350)

Remove the free Parallel Search MCP path and restore the keyed Parallel backend behavior from before it was introduced.

Also drops the keyless fallback registration/display labeling tests and returns the Parallel SDK pin to the prior version.

hermes_cli/tools_config.py

@@ -2182,13 +2182,8 @@ def _toolset_needs_configuration_prompt(
         tts_cfg = config.get("tts", {})
         return not isinstance(tts_cfg, dict) or "provider" not in tts_cfg
     if ts_key == "web":
-        # Web works out of the box via Parallel's free Search MCP (no key), so
-        # don't force setup just because ``web.backend`` is unset — only prompt
-        # when web isn't actually usable (e.g. an explicit backend configured
-        # without its credentials). Lazy import: web_tools is heavy and most
-        # tools_config callers don't need it.
-        from tools.web_tools import check_web_api_key
-        return not check_web_api_key()
+        web_cfg = config.get("web", {})
+        return not isinstance(web_cfg, dict) or "backend" not in web_cfg
     if ts_key == "browser":
         browser_cfg = config.get("browser", {})
         return not isinstance(browser_cfg, dict) or "cloud_provider" not in browser_cfg