feat(v5): add Inertia app shell with Flux health

Adds v5 routing, middleware, home page rendering, team context sharing,
project model/table support, and Flux health reporting. Installs Flux in
container builds with role-aware s6 services and documents runtime roles.

resources/js/v5/Pages/Home.jsx

@@ -0,0 +1,59 @@
+import { Head } from '@inertiajs/react';
+
+export default function Home({ status, currentTeam, teams, flux }) {
+    return (
+        <>
+            <Head title="V5" />
+
+            <main>
+                <p>{status}</p>
+
+                <h1>Coolify v5</h1>
+
+                <p>
+                    This page is served from Laravel through Inertia and React, with routes,
+                    assets, and future v5 tables isolated from the current v4 Livewire app.
+                </p>
+
+                <section aria-labelledby="flux-status-heading">
+                    <h2 id="flux-status-heading">Flux status</h2>
+
+                    <p>
+                        <strong>{flux.label}</strong>
+                    </p>
+
+                    <p>{flux.message}</p>
+
+                    {flux.socket ? <p>Socket: {flux.socket}</p> : null}
+                </section>
+
+                <h2>Current team</h2>
+
+                {currentTeam ? (
+                    <dl>
+                        <dt>Name</dt>
+                        <dd>{currentTeam.name}</dd>
+
+                        <dt>Description</dt>
+                        <dd>{currentTeam.description || 'No description'}</dd>
+
+                        <dt>Your role</dt>
+                        <dd>{currentTeam.role}</dd>
+                    </dl>
+                ) : (
+                    <p>No team selected.</p>
+                )}
+
+                <h2>Your teams</h2>
+
+                <ul>
+                    {teams.map((team) => (
+                        <li key={team.id}>
+                            {team.name} ({team.role})
+                        </li>
+                    ))}
+                </ul>
+            </main>
+        </>
+    );
+}

resources/js/v5/app.jsx

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+import { createInertiaApp } from '@inertiajs/react';
+import '../../css/v5/app.css';
+
+createInertiaApp({
+    id: 'v5-app',
+    pages: {
+        path: './Pages',
+        extension: '.jsx',
+    },
+    strictMode: true,
+});