refactor(presets): render presets in array order and prioritize partners

Remove the category-based grouping logic from ProviderPresetSelector,
letting the array position in each preset config file be the single
source of truth for display order. Move partner presets (PatewayAI,
火山Agentplan, BytePlus, DouBaoSeed) right after Shengsuanyun across
all 6 config files so they appear earlier in the UI.

src/components/providers/forms/ProviderForm.tsx

@@ -1251,23 +1251,6 @@ function ProviderFormFull({
     await onSubmit(payload);
   };
 
-  const groupedPresets = useMemo(() => {
-    return presetEntries.reduce<Record<string, PresetEntry[]>>((acc, entry) => {
-      const category = entry.preset.category ?? "others";
-      if (!acc[category]) {
-        acc[category] = [];
-      }
-      acc[category].push(entry);
-      return acc;
-    }, {});
-  }, [presetEntries]);
-
-  const categoryKeys = useMemo(() => {
-    return Object.keys(groupedPresets).filter(
-      (key) => key !== "custom" && groupedPresets[key]?.length,
-    );
-  }, [groupedPresets]);
-
   const shouldShowSpeedTest =
     category !== "official" && category !== "cloud_provider";
 
@@ -1553,8 +1536,7 @@ function ProviderFormFull({
           {!initialData && (
             <ProviderPresetSelector
               selectedPresetId={selectedPresetId}
-              groupedPresets={groupedPresets}
-              categoryKeys={categoryKeys}
+              presetEntries={presetEntries}
               presetCategoryLabels={presetCategoryLabels}
               onPresetChange={handlePresetChange}
               onUniversalPresetSelect={onUniversalPresetSelect}