feat: add tiered model pricing support (#67605)

Adds tiered model pricing support for cost tracking, keeps configured pricing ahead of cached catalog values, and includes latest Moonshot Kimi K2.6/K2.5 cost estimates.\n\nThanks @sliverp.

extensions/moonshot/provider-catalog.test.ts

@@ -19,6 +19,18 @@ describe("moonshot provider catalog", () => {
       "kimi-k2-thinking-turbo",
       "kimi-k2-turbo",
     ]);
+    expect(provider.models.find((model) => model.id === "kimi-k2.6")?.cost).toEqual({
+      input: 0.95,
+      output: 4,
+      cacheRead: 0.16,
+      cacheWrite: 0,
+    });
+    expect(provider.models.find((model) => model.id === "kimi-k2.5")?.cost).toEqual({
+      input: 0.6,
+      output: 3,
+      cacheRead: 0.1,
+      cacheWrite: 0,
+    });
   });
 
   it("opts native Moonshot baseUrls into streaming usage only inside the extension", () => {

extensions/moonshot/provider-catalog.ts

@@ -15,6 +15,18 @@ const MOONSHOT_DEFAULT_COST = {
   cacheRead: 0,
   cacheWrite: 0,
 };
+const MOONSHOT_K2_6_COST = {
+  input: 0.95,
+  output: 4,
+  cacheRead: 0.16,
+  cacheWrite: 0,
+};
+const MOONSHOT_K2_5_COST = {
+  input: 0.6,
+  output: 3,
+  cacheRead: 0.1,
+  cacheWrite: 0,
+};
 
 const MOONSHOT_MODEL_CATALOG = [
   {
@@ -22,7 +34,7 @@ const MOONSHOT_MODEL_CATALOG = [
     name: "Kimi K2.6",
     reasoning: false,
     input: ["text", "image"],
-    cost: MOONSHOT_DEFAULT_COST,
+    cost: MOONSHOT_K2_6_COST,
     contextWindow: MOONSHOT_DEFAULT_CONTEXT_WINDOW,
     maxTokens: MOONSHOT_DEFAULT_MAX_TOKENS,
   },
@@ -31,7 +43,7 @@ const MOONSHOT_MODEL_CATALOG = [
     name: "Kimi K2.5",
     reasoning: false,
     input: ["text", "image"],
-    cost: MOONSHOT_DEFAULT_COST,
+    cost: MOONSHOT_K2_5_COST,
     contextWindow: MOONSHOT_DEFAULT_CONTEXT_WINDOW,
     maxTokens: MOONSHOT_DEFAULT_MAX_TOKENS,
   },