fix(plan): a Claude plan is the one Anthropic reports now, not the sign-in's

An account signed in on Pro and upgraded to Max 5x kept showing "Pro": the
plan was read only from .credentials.json / .claude.json, whose
subscriptionType and rate-limit tiers are written at sign-in. fetchOwner
already asks GET /api/oauth/profile for a token's owner; it now also reads
organization_type / rate_limit_tier / seat_tier into a plan
(planFromProfile), remembered per account uuid (rememberLivePlan). The live
row, saved profiles (identityOf) and pool accounts (poolStatus, whose quota
refresh now asks a login's owner too) show that plan when one was seen
(shownPlan), else planLabel of the files as before.

server/__tests__/server-mode-account-pool.test.js

@@ -29,6 +29,7 @@ const cursorPool = require("../lib/cursor-pool");
 
 // The quota read would go to the network; the pool's list must not.
 require("../lib/cc-usage").fetchUsage = async () => ({});
+require("../lib/cc-usage").fetchOwner = async () => null;
 
 let server;
 let BASE;