Fix standalone database "restarting" status flickering and add restart tracking

- Fix status flickering: Track databases in active/transient states (restarting, starting, created, paused) not just running
- Add isActiveOrTransient() helper to distinguish between active states and terminal states (exited, dead)
- Add safeguard: Protect updateNotFoundDatabaseStatus() from marking as exited when containers collection is empty
- Add restart_count tracking: New migration adds restart_count, last_restart_at, last_restart_type to all standalone database tables
- Update 8 database models with $casts for new restart tracking fields
- Update GetContainersStatus to extract RestartCount from Docker and update database models
- Reset restart tracking when database exits completely

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

database/migrations/2025_12_17_000002_add_restart_tracking_to_standalone_databases.php

@@ -0,0 +1,66 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * The standalone database tables to add restart tracking columns to.
+     */
+    private array $tables = [
+        'standalone_postgresqls',
+        'standalone_mysqls',
+        'standalone_mariadbs',
+        'standalone_redis',
+        'standalone_mongodbs',
+        'standalone_keydbs',
+        'standalone_dragonflies',
+        'standalone_clickhouses',
+    ];
+
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        foreach ($this->tables as $table) {
+            if (! Schema::hasColumn($table, 'restart_count')) {
+                Schema::table($table, function (Blueprint $blueprint) {
+                    $blueprint->integer('restart_count')->default(0)->after('status');
+                });
+            }
+
+            if (! Schema::hasColumn($table, 'last_restart_at')) {
+                Schema::table($table, function (Blueprint $blueprint) {
+                    $blueprint->timestamp('last_restart_at')->nullable()->after('restart_count');
+                });
+            }
+
+            if (! Schema::hasColumn($table, 'last_restart_type')) {
+                Schema::table($table, function (Blueprint $blueprint) {
+                    $blueprint->string('last_restart_type', 10)->nullable()->after('last_restart_at');
+                });
+            }
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        $columns = ['restart_count', 'last_restart_at', 'last_restart_type'];
+
+        foreach ($this->tables as $table) {
+            foreach ($columns as $column) {
+                if (Schema::hasColumn($table, $column)) {
+                    Schema::table($table, function (Blueprint $blueprint) use ($column) {
+                        $blueprint->dropColumn($column);
+                    });
+                }
+            }
+        }
+    }
+};