feat: implement database management API with MySQL driver and schema operations

backend/app/Services/Database/MySqlDriver.php

@@ -454,4 +454,39 @@ class MySqlDriver implements DatabaseDriverInterface, SchemaDiscoveryInterface
         DB::connection($this->connectionName)->statement("CREATE DATABASE `{$name}` CHARACTER SET {$charset} COLLATE {$collation}");
         return true;
     }
+
+    public function dropDatabase(string $name): bool
+    {
+        DB::connection($this->connectionName)->statement("DROP DATABASE `{$name}`");
+        return true;
+    }
+
+    public function renameDatabase(string $oldName, string $newName): bool
+    {
+        // 1. Create new database
+        $this->createDatabase($newName);
+
+        // 2. Get tables from old database
+        $tables = $this->query("SHOW TABLES FROM `{$oldName}`");
+        $key = "Tables_in_{$oldName}";
+
+        if (!empty($tables)) {
+            $renameQueries = [];
+            foreach ($tables as $table) {
+                $tableName = $table->$key;
+                $renameQueries[] = "`{$oldName}`.`{$tableName}` TO `{$newName}`.`{$tableName}`";
+            }
+            
+            // 3. Rename all tables
+            if (!empty($renameQueries)) {
+                $sql = "RENAME TABLE " . implode(', ', $renameQueries);
+                DB::connection($this->connectionName)->statement($sql);
+            }
+        }
+
+        // 4. Drop old database
+        $this->dropDatabase($oldName);
+
+        return true;
+    }
 }

backend/app/Services/DatabaseService.php

@@ -172,4 +172,20 @@ class DatabaseService
     {
         return $this->getDriver()->createDatabase($name, $charset, $collation);
     }
+
+    /**
+     * Drop a database.
+     */
+    public function dropDatabase(string $name): bool
+    {
+        return $this->getDriver()->dropDatabase($name);
+    }
+
+    /**
+     * Rename a database.
+     */
+    public function renameDatabase(string $oldName, string $newName): bool
+    {
+        return $this->getDriver()->renameDatabase($oldName, $newName);
+    }
 }