fix: use normalized form 'maxplan' in PREMIUM_SUBSCRIPTION_TYPES set

The normalization regex strips underscores (/[\s_-]+/g), so 'max_plan'
normalizes to 'maxplan' which never matched the set entry 'max_plan'.
Changed the set entry to 'maxplan' to match the post-normalization form.

Author: cursoragent

apps/server/src/provider/Layers/ClaudeProvider.ts

@@ -269,7 +269,7 @@ function extractSubscriptionTypeFromOutput(result: CommandResult): string | unde
 /** Subscription types where the 1M context window is included in the plan. */
 const PREMIUM_SUBSCRIPTION_TYPES = new Set([
   "max",
-  "max_plan",
+  "maxplan",
   "max5",
   "max20",
   "enterprise",