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/protocol/src/account.rs

@@ -12,6 +12,7 @@ pub enum PlanType {
     Go,
     Plus,
     Pro,
+    ProLite,
     Team,
     #[serde(rename = "self_serve_business_usage_based")]
     #[ts(rename = "self_serve_business_usage_based")]
@@ -53,11 +54,19 @@ mod tests {
                 .expect("enterprise cbp usage based should serialize"),
             "\"enterprise_cbp_usage_based\""
         );
+        assert_eq!(
+            serde_json::to_string(&PlanType::ProLite).expect("prolite should serialize"),
+            "\"prolite\""
+        );
         assert_eq!(
             serde_json::from_str::<PlanType>("\"self_serve_business_usage_based\"")
                 .expect("self-serve business usage based should deserialize"),
             PlanType::SelfServeBusinessUsageBased
         );
+        assert_eq!(
+            serde_json::from_str::<PlanType>("\"prolite\"").expect("prolite should deserialize"),
+            PlanType::ProLite
+        );
         assert_eq!(
             serde_json::from_str::<PlanType>("\"enterprise_cbp_usage_based\"")
                 .expect("enterprise cbp usage based should deserialize"),

codex-rs/protocol/src/auth.rs

@@ -16,6 +16,7 @@ impl PlanType {
             "go" => Self::Known(KnownPlan::Go),
             "plus" => Self::Known(KnownPlan::Plus),
             "pro" => Self::Known(KnownPlan::Pro),
+            "prolite" => Self::Known(KnownPlan::ProLite),
             "team" => Self::Known(KnownPlan::Team),
             "self_serve_business_usage_based" => {
                 Self::Known(KnownPlan::SelfServeBusinessUsageBased)
@@ -36,6 +37,7 @@ pub enum KnownPlan {
     Go,
     Plus,
     Pro,
+    ProLite,
     Team,
     #[serde(rename = "self_serve_business_usage_based")]
     SelfServeBusinessUsageBased,
@@ -54,6 +56,7 @@ impl KnownPlan {
             Self::Go => "Go",
             Self::Plus => "Plus",
             Self::Pro => "Pro",
+            Self::ProLite => "Pro Lite",
             Self::Team => "Team",
             Self::SelfServeBusinessUsageBased => "Self Serve Business Usage Based",
             Self::Business => "Business",
@@ -69,6 +72,7 @@ impl KnownPlan {
             Self::Go => "go",
             Self::Plus => "plus",
             Self::Pro => "pro",
+            Self::ProLite => "prolite",
             Self::Team => "team",
             Self::SelfServeBusinessUsageBased => "self_serve_business_usage_based",
             Self::Business => "business",

codex-rs/protocol/src/error.rs

@@ -493,7 +493,7 @@ impl std::fmt::Display for UsageLimitReachedError {
                     retry_suffix_after_or(self.resets_at.as_ref())
                 )
             }
-            Some(PlanType::Known(KnownPlan::Pro)) => format!(
+            Some(PlanType::Known(KnownPlan::Pro | KnownPlan::ProLite)) => format!(
                 "You've hit your usage limit. Visit https://chatgpt.com/codex/settings/usage to purchase more credits{}",
                 retry_suffix_after_or(self.resets_at.as_ref())
             ),