feat(pricing): add display pricing for Qwen 3.8 Flash and GLM 5.3 Flash

Qwen/Qwen3.8-Flash lists $0.16 input, $0.47 output, and $0.016 cache read
per million tokens, and z-ai/glm-5.3-flash lists $0.15, $0.50, and $0.03;
the official pricing page documents no cache-write rate for either model.

tests/fixtures/commandcode-model-ids.json

@@ -24,6 +24,7 @@
     "moonshotai/Kimi-K2.7-Code-Highspeed",
     "moonshotai/Kimi-K2.6",
     "moonshotai/Kimi-K2.5",
+    "z-ai/glm-5.3-flash",
     "zai-org/GLM-5.3",
     "zai-org/GLM-5.2",
     "zai-org/GLM-5.2-Fast",
@@ -36,6 +37,7 @@
     "xiaomi/mimo-v2.5",
     "Qwen/Qwen3.8-Max",
     "Qwen/Qwen3.8-27B",
+    "Qwen/Qwen3.8-Flash",
     "Qwen/Qwen3.7-Max",
     "Qwen/Qwen3.7-Plus",
     "Qwen/Qwen3.7-Flash",