fix(server): handle limit edge case and IPv6 allowlist dedupe

Update server limit enforcement to re-enable force-disabled servers when the
team is at or under its limit (`<= 0` condition).

Improve allowlist validation and matching by:
- supporting IPv6 CIDR mask ranges up to `/128`
- adding IPv6-aware CIDR matching in `checkIPAgainstAllowlist`
- normalizing/deduplicating redundant allowlist entries before saving

Add feature tests for `ServerLimitCheckJob` covering under-limit, at-limit,
over-limit, and no-op scenarios.

tests/Feature/ServerLimitCheckJobTest.php

@@ -0,0 +1,83 @@
+<?php
+
+use App\Jobs\ServerLimitCheckJob;
+use App\Models\Server;
+use App\Models\Team;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Notification;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    config()->set('constants.coolify.self_hosted', false);
+
+    Notification::fake();
+
+    $this->team = Team::factory()->create(['custom_server_limit' => 5]);
+});
+
+function createServerForTeam(Team $team, bool $forceDisabled = false): Server
+{
+    $server = Server::factory()->create(['team_id' => $team->id]);
+    if ($forceDisabled) {
+        $server->settings()->update(['force_disabled' => true]);
+    }
+
+    return $server->fresh(['settings']);
+}
+
+it('re-enables force-disabled servers when under the limit', function () {
+    createServerForTeam($this->team);
+    $server2 = createServerForTeam($this->team, forceDisabled: true);
+    $server3 = createServerForTeam($this->team, forceDisabled: true);
+
+    expect($server2->settings->force_disabled)->toBeTruthy();
+    expect($server3->settings->force_disabled)->toBeTruthy();
+
+    // 3 servers, limit 5 → all should be re-enabled
+    ServerLimitCheckJob::dispatchSync($this->team);
+
+    expect($server2->fresh()->settings->force_disabled)->toBeFalsy();
+    expect($server3->fresh()->settings->force_disabled)->toBeFalsy();
+});
+
+it('re-enables force-disabled servers when exactly at the limit', function () {
+    $this->team->update(['custom_server_limit' => 3]);
+
+    createServerForTeam($this->team);
+    createServerForTeam($this->team);
+    $server3 = createServerForTeam($this->team, forceDisabled: true);
+
+    // 3 servers, limit 3 → disabled one should be re-enabled
+    ServerLimitCheckJob::dispatchSync($this->team);
+
+    expect($server3->fresh()->settings->force_disabled)->toBeFalsy();
+});
+
+it('disables newest servers when over the limit', function () {
+    $this->team->update(['custom_server_limit' => 2]);
+
+    $oldest = createServerForTeam($this->team);
+    sleep(1);
+    $middle = createServerForTeam($this->team);
+    sleep(1);
+    $newest = createServerForTeam($this->team);
+
+    // 3 servers, limit 2 → newest 1 should be disabled
+    ServerLimitCheckJob::dispatchSync($this->team);
+
+    expect($oldest->fresh()->settings->force_disabled)->toBeFalsy();
+    expect($middle->fresh()->settings->force_disabled)->toBeFalsy();
+    expect($newest->fresh()->settings->force_disabled)->toBeTruthy();
+});
+
+it('does not change servers when under limit and none are force-disabled', function () {
+    $server1 = createServerForTeam($this->team);
+    $server2 = createServerForTeam($this->team);
+
+    // 2 servers, limit 5 → nothing to do
+    ServerLimitCheckJob::dispatchSync($this->team);
+
+    expect($server1->fresh()->settings->force_disabled)->toBeFalsy();
+    expect($server2->fresh()->settings->force_disabled)->toBeFalsy();
+});