Add optional Nanobot plugin controls (#4396)

* feat: add optional nanobot features

* test: update azure install hint expectation

* fix: validate optional feature extras

maintainer edit: verify requested dependency extras before treating optional features as installed, propagate restart state from feature enablement, and align docs with the new plugins enable command.

* fix: bound optional feature installs

maintainer edit: make optional feature installs time out as a normal install failure instead of leaving the WebUI or CLI action waiting indefinitely.

* feat: slim optional channel dependencies

* fix: log optional install commands

* fix(webui): gate remote feature installs

* docs: clarify webhook plugin example

* fix(webui): harden optional feature installs

* fix: install optional deps without package fallback

* fix(cli): refine plugin feature controls

* fix(webui): count enabled nanobot features

* fix(webui): allow slow feature install routes

* fix(webui): allow disabling websocket channel

* fix(plugins): simplify optional feature controls

* fix(webui): polish apps catalog states

* fix(webui): confirm nanobot support installs

* fix(webui): polish nanobot install dialog

* fix(webui): suppress empty websocket handshakes

* fix(webui): clarify apps plugin summary

* fix(webui): localize workspace access copy

* fix(plugins): polish optional feature controls (#4691)

---------

Co-authored-by: Xubin Ren <52506698+Re-bin@users.noreply.github.com>

tests/providers/test_azure_openai_provider.py

@@ -156,7 +156,7 @@ def test_init_explicit_key_does_not_construct_credential(monkeypatch):
 
 
 def test_init_missing_key_without_azure_identity_raises(monkeypatch):
-    """Clear RuntimeError with pip-install hint when azure-identity is missing."""
+    """Clear RuntimeError with install hint when azure-identity is missing."""
     # Force the import inside _AzureTokenProvider to fail.
     real_import = __builtins__["__import__"] if isinstance(__builtins__, dict) else __builtins__.__import__
 
@@ -166,7 +166,7 @@ def test_init_missing_key_without_azure_identity_raises(monkeypatch):
         return real_import(name, *args, **kwargs)
 
     with patch("builtins.__import__", side_effect=fake_import):
-        with pytest.raises(RuntimeError, match=r"pip install 'nanobot-ai\[azure\]'"):
+        with pytest.raises(RuntimeError, match=r"nanobot plugins enable azure"):
             AzureOpenAIProvider(api_key="", api_base="https://res.openai.azure.com")