fix(create): suggest vp run for all templates (#1127)

## Summary
- Fix `vp create` to suggest `vp run` instead of `vp dev` for
non-Vite-native templates (Astro, Nuxt, etc.)
- Also fix the monorepo path: non-builtin templates now suggest `cd
<dir> && vp run` instead of `vp dev <dir>`
- Extract `getCreateNextCommand` and `getNextCommand` to `utils.ts` for
testability
- Add unit tests covering all template type × environment
(standalone/monorepo) combinations
- Add snap tests for monorepo next command verification

Closes #1123

---------

Co-authored-by: MK (fengmk2) <fengmk2@gmail.com>

Author: jong-kyung

packages/cli/snap-tests-global/create-next-command-application/snap.txt

@@ -0,0 +1,6 @@
+> vp create vite:application --no-interactive # verify next command suggests vp run
+
+Using default package name: vite-plus-application
+◇ Scaffolded vite-plus-application with Vite application
+• Node <semver>  pnpm <semver>
+→ Next: cd vite-plus-application && vp run

packages/cli/snap-tests-global/create-next-command-application/steps.json

@@ -0,0 +1,8 @@
+{
+  "commands": [
+    {
+      "command": "vp create vite:application --no-interactive # verify next command suggests vp run",
+      "ignoreOutput": false
+    }
+  ]
+}

packages/cli/snap-tests-global/create-next-command-library/snap.txt

@@ -0,0 +1,6 @@
+> vp create vite:library --no-interactive # verify next command suggests vp run
+
+Using default package name: vite-plus-library
+◇ Scaffolded vite-plus-library with TypeScript library
+• Node <semver>  pnpm <semver>
+→ Next: cd vite-plus-library && vp run

packages/cli/snap-tests-global/create-next-command-library/steps.json

@@ -0,0 +1,8 @@
+{
+  "commands": [
+    {
+      "command": "vp create vite:library --no-interactive # verify next command suggests vp run",
+      "ignoreOutput": false
+    }
+  ]
+}

packages/cli/snap-tests-global/create-next-command-monorepo-application/apps/existing-app/package.json

@@ -0,0 +1,3 @@
+{
+  "name": "existing-app"
+}

packages/cli/snap-tests-global/create-next-command-monorepo-application/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "test-monorepo",
+  "workspaces": [
+    "apps/*"
+  ]
+}

packages/cli/snap-tests-global/create-next-command-monorepo-application/snap.txt

@@ -0,0 +1,6 @@
+> vp create vite:application --no-interactive # monorepo: next command should suggest vp run
+
+Using default package name: vite-plus-application
+◇ Scaffolded apps/vite-plus-application with Vite application
+• Node <semver>  pnpm <semver>
+→ Next: cd apps/vite-plus-application && vp run

packages/cli/snap-tests-global/create-next-command-monorepo-application/steps.json

@@ -0,0 +1,8 @@
+{
+  "commands": [
+    {
+      "command": "vp create vite:application --no-interactive # monorepo: next command should suggest vp run",
+      "ignoreOutput": false
+    }
+  ]
+}

packages/cli/snap-tests-global/create-next-command-monorepo-library/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "test-monorepo",
+  "workspaces": [
+    "packages/*"
+  ]
+}

packages/cli/snap-tests-global/create-next-command-monorepo-library/packages/existing-lib/package.json

@@ -0,0 +1,3 @@
+{
+  "name": "existing-lib"
+}