feat(models): add MiniMax-M3 to native minimax providers + 1M context (#36214)

Add MiniMax-M3 to the minimax, minimax-oauth, and minimax-cn curated
lists (these are hardcoded — the native Anthropic-format endpoint has no
/v1/models listing and the providers aren't in _MODELS_DEV_PREFERRED, so
new models don't auto-pull). Add a DEFAULT_CONTEXT_LENGTHS key
'minimax-m3' -> 1,000,000 so M3 resolves to its 1M context on every
surface (native ID + OpenRouter/Nous slug) via longest-key-first
substring match, while the M2.x series stays at 204,800.

hermes_cli/models.py

@@ -295,16 +295,19 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "kimi-k2-0905-preview",
     ],
     "minimax": [
+        "MiniMax-M3",
         "MiniMax-M2.7",
         "MiniMax-M2.5",
         "MiniMax-M2.1",
         "MiniMax-M2",
     ],
     "minimax-oauth": [
+        "MiniMax-M3",
         "MiniMax-M2.7",
         "MiniMax-M2.7-highspeed",
     ],
     "minimax-cn": [
+        "MiniMax-M3",
         "MiniMax-M2.7",
         "MiniMax-M2.5",
         "MiniMax-M2.1",