Say an ended trial up front in list_connectors; any user can reactivate - #1576

Summary

Two follow-ups to #1574, from the production test on 2026-11-07:

1. List connectors on an ended trial. On a workspace whose trial ended, anythingmcp_list_connectors answered as if everything worked. The user only learned about the ended trial when a tool call failed. The list now starts with a trialEnded block: the same message and reactivation link a blocked call gives, plus a hint to show the link first. The connectors are still listed. This applies on the shared endpoint (Claude Directory and the default set) and in the ChatGPT database plugin.
2. Blocked-call text. The text no longer says "an administrator can reactivate the workspace". Both links (the no-login page and the pricing page) let anyone choose a plan and pay without signing in. New wording: "To keep using this tool, the user reactivates the workspace by choosing a plan at the link below; no sign-in is needed."

Changes

• DynamicMcpTools.trialEndedNotice(orgId, userId): runs the licence check. On TrialEndedException it returns { message, reactivateUrl }, using the same A/B link as a blocked call (trialReactivationLink). Otherwise it returns null: active licence, self-hosted, or any other refusal.
• SharedToolsetDeps.trialEnded?, wired in mcp-endpoint.controller.ts to the connection's workspace (the setup org, else the grant or user org).
• trialEndedBlock() is used by both anythingmcp_list_connectors implementations. It is best-effort: an error there leaves the list unchanged.
• No event is recorded for the notice. trial_expired_call_blocked still counts real blocked calls only, so the blocked-calls email and the A/B denominator are unchanged.

Deployment modes

• Cloud: as above.
• Self-hosted: checkLicenseActive never throws TrialEndedException there, so there is no block and no change.

Type

• Bug fix

Testing

• Added/updated unit tests

In packages/backend:

• npx jest --maxWorkers=4 src/mcp-server src/license: 1,030 passed, 5 skipped. New specs:
  • the list with and without the notice, and with a failing notice;
  • the executor notice;
  • the text without "administrator".
• npx tsc --noEmit -p tsconfig.json: clean.
• npx eslint on the 7 changed files: clean.

Checklist

• My code follows the existing code style
• I have tested my changes locally
• This PR has a descriptive title