Support prolite plan type (#17419)

Addresses #17353

Problem: Codex rate-limit fetching failed when the backend returned the
new `prolite` subscription plan type.

Solution: Add `prolite` to the backend/account/auth plan mappings, keep
unknown WHAM plan values decodable, and regenerate app-server plan
schemas.

codex-rs/login/src/auth/manager.rs

@@ -314,6 +314,7 @@ impl CodexAuth {
             InternalKnownPlan::Go => AccountPlanType::Go,
             InternalKnownPlan::Plus => AccountPlanType::Plus,
             InternalKnownPlan::Pro => AccountPlanType::Pro,
+            InternalKnownPlan::ProLite => AccountPlanType::ProLite,
             InternalKnownPlan::Team => AccountPlanType::Team,
             InternalKnownPlan::SelfServeBusinessUsageBased => {
                 AccountPlanType::SelfServeBusinessUsageBased