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* feat(mcp): scope a key to zero MCP servers with no-mcp-servers sentinel
A key under a team that has MCP servers had no way to opt out of them;
an empty list has always meant "inherit the team". This adds a
no-mcp-servers sentinel (mirroring no-default-models for models) so a key
can declare an explicit zero that overrides team inheritance, additive
grants, and allow_all_keys servers, surfaced as an exclusive "No MCP
Servers" option in the key create/edit UI.
* refactor(ui): centralize no-mcp-servers sentinel in a shared constant
The sentinel string was defined under two different local names and
inlined in two more files; a single exported constant removes the drift
risk flagged in review.
* fix(mcp): enforce no-mcp-servers sentinel on toolset-scoped routes
Toolset scoping replaced a key's mcp_servers with the toolset's servers,
dropping the no-mcp-servers sentinel, so a key opted out of all MCP could
still execute a granted toolset's tools via /toolset/{name}/mcp. Deny
toolset access when the key carries the sentinel, checked before the admin
branch to match get_allowed_mcp_servers.
(cherry picked from commit
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