feat: implement database schema discovery and management services with frontend integration

backend/app/Services/Database/MySqlDriver.php

@@ -302,4 +302,41 @@ class MySqlDriver implements DatabaseDriverInterface, SchemaDiscoveryInterface
 
         return $this->query($sql, [$database]);
     }
+
+    public function batchUpdate(string $table, array $changes): bool
+    {
+        $connection = $this->getConnection();
+        
+        // Find primary key
+        $schema = $this->getTableSchema($table);
+        $primaryKey = 'id'; // default
+        foreach ($schema as $col) {
+            if (($col->Key ?? '') === 'PRI') {
+                $primaryKey = $col->Field;
+                break;
+            }
+        }
+
+        $connection->beginTransaction();
+        try {
+            foreach ($changes as $change) {
+                if (!isset($change[$primaryKey])) {
+                    continue;
+                }
+                
+                $id = $change[$primaryKey];
+                $updateData = $change;
+                unset($updateData[$primaryKey]);
+                
+                if (empty($updateData)) continue;
+
+                $connection->table($table)->where($primaryKey, $id)->update($updateData);
+            }
+            $connection->commit();
+            return true;
+        } catch (\Exception $e) {
+            $connection->rollBack();
+            throw $e;
+        }
+    }
 }

backend/app/Services/DatabaseService.php

@@ -156,4 +156,12 @@ class DatabaseService
     {
         return $this->getDriver()->getTablesMetadata($database);
     }
+
+    /**
+     * Perform batch update on a table.
+     */
+    public function batchUpdate(string $table, array $changes): bool
+    {
+        return $this->getDriver()->batchUpdate($table, $changes);
+    }
 }