refactor(cli): move UserConfig module augmentation to define-config.ts

Move the `declare module '@voidzero-dev/vite-plus-core'` augmentation
from index.ts to define-config.ts where the augmented UserConfig type
is actually used. This keeps the augmentation and its usage together,
simplifies index.ts to pure re-exports, and avoids tsdown DTS bundling
issues with cross-file namespace references.

Author: fengmk2

packages/cli/src/define-config.ts

@@ -2,7 +2,37 @@ import type { UserConfig } from '@voidzero-dev/vite-plus-core';
 import {
   defineConfig as viteDefineConfig,
   type ConfigEnv,
+  type Plugin as VitestPlugin,
 } from '@voidzero-dev/vite-plus-test/config';
+import type { OxfmtConfig } from 'oxfmt';
+import type { OxlintConfig } from 'oxlint';
+
+import type { PackUserConfig } from './pack.ts';
+import type { RunConfig } from './run-config.ts';
+import type { StagedConfig } from './staged-config.ts';
+
+declare module '@voidzero-dev/vite-plus-core' {
+  interface UserConfig {
+    /**
+     * Options for oxlint
+     */
+    lint?: OxlintConfig;
+
+    fmt?: OxfmtConfig;
+
+    pack?: PackUserConfig | PackUserConfig[];
+
+    run?: RunConfig;
+
+    staged?: StagedConfig;
+
+    // temporary solution to load plugins lazily
+    // We need to support this in the upstream vite
+    lazy?: () => Promise<{
+      plugins?: VitestPlugin[];
+    }>;
+  }
+}
 
 type ViteUserConfigFnObject = (env: ConfigEnv) => UserConfig;
 type ViteUserConfigFnPromise = (env: ConfigEnv) => Promise<UserConfig>;

packages/cli/src/index.ts

@@ -1,34 +1,4 @@
-import { type Plugin as VitestPlugin } from '@voidzero-dev/vite-plus-test/config';
-import type { OxfmtConfig } from 'oxfmt';
-import type { OxlintConfig } from 'oxlint';
-
 import { defineConfig } from './define-config.ts';
-import type { PackUserConfig } from './pack.ts';
-import type { RunConfig } from './run-config.ts';
-import type { StagedConfig } from './staged-config.ts';
-
-declare module '@voidzero-dev/vite-plus-core' {
-  interface UserConfig {
-    /**
-     * Options for oxlint
-     */
-    lint?: OxlintConfig;
-
-    fmt?: OxfmtConfig;
-
-    pack?: PackUserConfig | PackUserConfig[];
-
-    run?: RunConfig;
-
-    staged?: StagedConfig;
-
-    // temporary solution to load plugins lazily
-    // We need to support this in the upstream vite
-    lazy?: () => Promise<{
-      plugins?: VitestPlugin[];
-    }>;
-  }
-}
 
 export * from '@voidzero-dev/vite-plus-core';