feat!: replace Inertia Vite plugin with @adonisjs/vite serverEntrypoints

[thetutlage]

Summary

• Drops the @adonisjs/inertia/vite plugin and the ssr.bundle config field.
• Wires ServerRenderer.render() through the new vite.loadServerModule() API shipped in @adonisjs/vite@6.0.0-next.0.
• Bumps @adonisjs/vite peer + dev dep to ^6.0.0-next.0, vite dev dep to ^8.0.0.

Why

@adonisjs/vite@6 ships a serverEntrypoints plugin option that owns SSR build configuration, plus vite.loadServerModule() that loads SSR modules in both dev (Vite module runner with HMR-driven cache invalidation) and production (pre-built bundle resolved through the SSR manifest). With that landed, the Inertia-side plugin and bundle plumbing duplicate what @adonisjs/vite already does. Removing it cuts surface area and prevents the two plugins from fighting over environments.ssr config.

What changes

• src/server_renderer.ts — collapses to a thin wrapper around vite.loadServerModule(config.ssr.entrypoint). The ModuleRunner ownership, restart-detect on server.environments.ssr swaps, and per-render clearCache are all gone (@adonisjs/vite owns runner lifecycle now; HMR keeps the cache fresh, no manual reset needed).
• src/types.ts + src/define_config.ts — drop ssr.bundle. SSR bundle file path is no longer user-controlled; the SSR manifest is the source of truth.
• src/client/vite.ts — deleted. ./vite removed from package exports and tsdown.config.ts entry list.
• tests/inertia.spec.ts — production-mode SSR test rewritten to set up an SSR manifest under <buildDirectory>/server/.vite/manifest.json instead of pointing ssr.bundle at a file directly.

Migration

In vite.config.ts:

-import inertia from '@adonisjs/inertia/vite'
 import adonisjs from '@adonisjs/vite/client'

 export default defineConfig({
   plugins: [
     adonisjs({
       entrypoints: ['inertia/app/app.tsx'],
+      serverEntrypoints: ['inertia/app/ssr.tsx'],
     }),
-    inertia({ ssr: { enabled: true, entrypoint: 'inertia/app/ssr.tsx' } }),
   ],
 })

In config/inertia.ts:

 export default defineConfig({
   ssr: {
     enabled: true,
     entrypoint: 'inertia/app/ssr.tsx',
-    bundle: 'ssr/ssr.js',
   },
 })

Test plan

• npm run typecheck clean
• Full suite green: 172 passed, 4 skipped (186)
• Manual sanity check against a real Inertia app: dev SSR renders, prod build + load works end-to-end