chore: regroup registry order by vendor

GLM-5.1 -> 120 (beside GLM-5.2/Turbo), DeepSeek V4 Flash -> 90.5 (beside V4-Pro), Nex-AGI -> 65 (out of the xAI block).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

models/glm-5-1.json

@@ -4,7 +4,7 @@
   "harness": "ZCode",
   "effort": "Max",
   "artifactDir": "glm-5-1/zcode-max",
-  "order": 20,
+  "order": 120,
   "runs": {
     "pelican-cycling": {
       "note": {