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>

nanobot/providers/azure_openai_provider.py

@@ -14,7 +14,7 @@ Two modes are supported, selected automatically:
    falls back to :class:`azure.identity.aio.DefaultAzureCredential` and
    acquires a bearer token scoped to
    ``https://cognitiveservices.azure.com/.default``.  ``azure-identity``
-   is an optional dependency installed via ``pip install nanobot-ai[azure]``.
+   is an optional dependency installed via ``nanobot plugins enable azure``.
 """
 
 from __future__ import annotations
@@ -55,7 +55,7 @@ class _AzureTokenProvider:
         except ImportError as exc:
             raise RuntimeError(
                 "Azure OpenAI AAD authentication requires the 'azure-identity' package. "
-                "Install it with: pip install 'nanobot-ai[azure]'"
+                "Run: nanobot plugins enable azure"
             ) from exc
 
         self._scope = scope

nanobot/providers/bedrock_provider.py

@@ -71,7 +71,7 @@ class BedrockProvider(LLMProvider):
             import boto3
         except ImportError as exc:  # pragma: no cover - exercised only without boto3 installed
             raise RuntimeError(
-                "AWS Bedrock provider requires boto3. Install it with `pip install boto3`."
+                "AWS Bedrock provider requires boto3. Run `nanobot plugins enable bedrock`."
             ) from exc
 
         session_kwargs: dict[str, Any] = {}