Fix bug identified on Shopware's Ci on TypePHP's end

[rcalicdan]

In PHP, constructors do not follow LSP and child classes often declare completely different constructor parameters than their parents.

Previously, ContractParser::resolveTargetParamName() used positional index fallback to map missing parameter docblocks from parent constructors to child constructors. In frameworks like Shopware, this caused parent constructor docblocks (e.g. @param array $parameters at index 1) to be incorrectly mapped onto child parameters (e.g. ?\Throwable $previousException at index 1), throwing false TypeError exceptions.

• Disabled positional index fallback for __construct() methods in ContractParser.
• Child constructors now only inherit docblocks from parent constructors if the parameter names match explicitly.
• Normal methods continue to support positional renaming for LSP method overriding.