chore(v5): archive V5 implementation and remove runtime integration

Move V5 source, migrations, UI, scripts, and tests into documentation, then remove V5 routes, models, jobs, configuration, dependencies, and application hooks.

app/Models/Project.php

@@ -2,9 +2,6 @@
 
 namespace App\Models;
 
-use App\Models\V5\Application as V5Application;
-use App\Models\V5\ResourceConnection as V5ResourceConnection;
-use App\Support\V5\V5Feature;
 use App\Traits\ClearsGlobalSearchCache;
 use App\Traits\HasSafeStringAttribute;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -147,11 +144,7 @@ class Project extends BaseModel
 
     public function isEmpty()
     {
-        return (! V5Feature::enabled() || (
-            ! V5Application::query()->where('project_id', $this->id)->exists() &&
-            ! V5ResourceConnection::query()->where('project_id', $this->id)->exists()
-        )) &&
-            $this->applications()->count() == 0 &&
+        return $this->applications()->count() == 0 &&
             $this->redis()->count() == 0 &&
             $this->postgresqls()->count() == 0 &&
             $this->mysqls()->count() == 0 &&