fix(server): improve IP uniqueness validation with team-specific error messages

- Refactor server IP duplicate detection to use `first()` instead of `get()->count()`
- Add team-scoped validation to distinguish between same-team and cross-team IP conflicts
- Update error messages to clarify ownership: "already exists in your team" vs "in use by another team"
- Apply consistent validation logic across API, boarding, and server management flows
- Add comprehensive test suite for IP uniqueness enforcement across teams

app/Http/Controllers/Api/ServersController.php

@@ -519,9 +519,13 @@ class ServersController extends Controller
         if (! $privateKey) {
             return response()->json(['message' => 'Private key not found.'], 404);
         }
-        $allServers = ModelsServer::whereIp($request->ip)->get();
-        if ($allServers->count() > 0) {
-            return response()->json(['message' => 'Server with this IP already exists.'], 400);
+        $foundServer = ModelsServer::whereIp($request->ip)->first();
+        if ($foundServer) {
+            if ($foundServer->team_id === $teamId) {
+                return response()->json(['message' => 'A server with this IP/Domain already exists in your team.'], 400);
+            }
+
+            return response()->json(['message' => 'A server with this IP/Domain is already in use by another team.'], 400);
         }
 
         $proxyType = $request->proxy_type ? str($request->proxy_type)->upper() : ProxyTypes::TRAEFIK->value;

app/Livewire/Boarding/Index.php

@@ -283,7 +283,11 @@ class Index extends Component
         $this->privateKey = formatPrivateKey($this->privateKey);
         $foundServer = Server::whereIp($this->remoteServerHost)->first();
         if ($foundServer) {
-            return $this->dispatch('error', 'IP address is already in use by another team.');
+            if ($foundServer->team_id === currentTeam()->id) {
+                return $this->dispatch('error', 'A server with this IP/Domain already exists in your team.');
+            }
+
+            return $this->dispatch('error', 'A server with this IP/Domain is already in use by another team.');
         }
         $this->createdServer = Server::create([
             'name' => $this->remoteServerName,

app/Livewire/Server/New/ByIp.php

@@ -97,10 +97,13 @@ class ByIp extends Component
         $this->validate();
         try {
             $this->authorize('create', Server::class);
-            if (Server::where('team_id', currentTeam()->id)
-                ->where('ip', $this->ip)
-                ->exists()) {
-                return $this->dispatch('error', 'This IP/Domain is already in use by another server in your team.');
+            $foundServer = Server::whereIp($this->ip)->first();
+            if ($foundServer) {
+                if ($foundServer->team_id === currentTeam()->id) {
+                    return $this->dispatch('error', 'A server with this IP/Domain already exists in your team.');
+                }
+
+                return $this->dispatch('error', 'A server with this IP/Domain is already in use by another team.');
             }
 
             if (is_null($this->private_key_id)) {

app/Livewire/Server/Show.php

@@ -189,12 +189,16 @@ class Show extends Component
             $this->validate();
 
             $this->authorize('update', $this->server);
-            if (Server::where('team_id', currentTeam()->id)
-                ->where('ip', $this->ip)
+            $foundServer = Server::where('ip', $this->ip)
                 ->where('id', '!=', $this->server->id)
-                ->exists()) {
+                ->first();
+            if ($foundServer) {
                 $this->ip = $this->server->ip;
-                throw new \Exception('This IP/Domain is already in use by another server in your team.');
+                if ($foundServer->team_id === currentTeam()->id) {
+                    throw new \Exception('A server with this IP/Domain already exists in your team.');
+                }
+
+                throw new \Exception('A server with this IP/Domain is already in use by another team.');
             }
 
             $this->server->name = $this->name;