fix: agent tool selector marketplace checks for local and builtin tools

[leslie2046]

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   fixes The frontend page reports an error due to adding a local plugin in the agent node #37023

Summary

This PR fixes the agent tool selector refresh flow so builtin tools and locally installed plugins no longer trigger incorrect marketplace requests.

Key changes:

• Stop inferring plugin IDs directly from provider_name for unresolved tools.
• Only run marketplace checks when the provider is confirmed to be plugin-backed and the current provider or tool cannot be resolved locally.
• Preserve marketplace fallback for real marketplace plugins and legacy built-in values where the plugin identity can still be determined safely.
• Persist plugin_id in ToolValue so refresh/recovery logic can rely on explicit plugin metadata instead of guessing.

This prevents false marketplace lookups such as builtin tools like time and unresolved local plugins after page refresh, while keeping the install/upgrade UX for actual marketplace plugins intact.

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint && make type-check (backend) and cd web && pnpm exec vp staged (frontend) to appease the lint gods