feat: implement database management service layer with MySQL driver and API controllers

backend/app/Services/Database/MySqlDriver.php

@@ -448,4 +448,10 @@ class MySqlDriver implements DatabaseDriverInterface, SchemaDiscoveryInterface
         fclose($handle);
         return $path;
     }
+
+    public function createDatabase(string $name, string $charset = 'utf8mb4', string $collation = 'utf8mb4_unicode_ci'): bool
+    {
+        DB::connection($this->connectionName)->statement("CREATE DATABASE `{$name}` CHARACTER SET {$charset} COLLATE {$collation}");
+        return true;
+    }
 }

backend/app/Services/DatabaseService.php

@@ -164,4 +164,12 @@ class DatabaseService
     {
         return $this->getDriver()->batchUpdate($table, $changes);
     }
+
+    /**
+     * Create a new database.
+     */
+    public function createDatabase(string $name, string $charset = 'utf8mb4', string $collation = 'utf8mb4_unicode_ci'): bool
+    {
+        return $this->getDriver()->createDatabase($name, $charset, $collation);
+    }
 }