refactor: consolidate provider form components

This commit completes Stage 2.5-2.6 of the refactoring plan by:

- Consolidating 8 provider form files (1941+ lines) into a single
  unified ProviderForm component (353 lines), reducing code by ~82%
- Implementing modern form management with react-hook-form and zod
- Adding preset provider categorization with grouped select UI
- Supporting dual-mode operation for both Claude and Codex configs
- Removing redundant subcomponents:
  - ApiKeyInput.tsx (72 lines)
  - ClaudeConfigEditor.tsx (205 lines)
  - CodexConfigEditor.tsx (667 lines)
  - EndpointSpeedTest.tsx (636 lines)
  - KimiModelSelector.tsx (195 lines)
  - PresetSelector.tsx (119 lines)

Key improvements:
- Type-safe form values with ProviderFormValues extension
- Automatic template value application for presets
- Better internationalization coverage
- Cleaner separation of concerns
- Enhanced UX with categorized preset groups

Updates AddProviderDialog and EditProviderDialog to pass appType prop
and handle preset category metadata.

src/components/providers/EditProviderDialog.tsx

@@ -12,12 +12,14 @@ import {
   ProviderForm,
   type ProviderFormValues,
 } from "@/components/providers/forms/ProviderForm";
+import type { AppType } from "@/lib/api";
 
 interface EditProviderDialogProps {
   open: boolean;
   provider: Provider | null;
   onOpenChange: (open: boolean) => void;
   onSubmit: (provider: Provider) => Promise<void> | void;
+  appType: AppType;
 }
 
 export function EditProviderDialog({
@@ -25,6 +27,7 @@ export function EditProviderDialog({
   provider,
   onOpenChange,
   onSubmit,
+  appType,
 }: EditProviderDialogProps) {
   const { t } = useTranslation();
 
@@ -42,6 +45,9 @@ export function EditProviderDialog({
         name: values.name.trim(),
         websiteUrl: values.websiteUrl?.trim() || undefined,
         settingsConfig: parsedConfig,
+        ...(values.presetCategory
+          ? { category: values.presetCategory }
+          : {}),
       };
 
       await onSubmit(updatedProvider);
@@ -69,6 +75,7 @@ export function EditProviderDialog({
         </DialogHeader>
 
         <ProviderForm
+          appType={appType}
           submitLabel={t("common.save", { defaultValue: "保存" })}
           onSubmit={handleSubmit}
           onCancel={() => onOpenChange(false)}