feat(providers): add glm-5.3 to GLM Coding and GLM (China) registries

Zhipu released GLM-5.3 on both api.z.ai and open.bigmodel.cn coding
endpoints. Verified live against both, returning model:"glm-5.3" with
native reasoning_content.

No other changes needed: the '*glm-5*' family pattern in capabilities.js
and 'glm-5*' in pricing.js already cover it.

open-sse/providers/registry/glm-cn.js

@@ -21,6 +21,7 @@ export default {
     },
   },
   models: [
+    { id: "glm-5.3", name: "GLM 5.3" },
     { id: "glm-5.2", name: "GLM 5.2" },
     { id: "glm-5.1", name: "GLM 5.1" },
     { id: "glm-5", name: "GLM 5" },

open-sse/providers/registry/glm.js

@@ -45,6 +45,7 @@ export default {
     },
   ],
   models: [
+    { id: "glm-5.3", name: "GLM 5.3" },
     { id: "glm-5.2", name: "GLM 5.2" },
     { id: "glm-5.1", name: "GLM 5.1" },
     { id: "glm-5", name: "GLM 5" },