fix: InboundService fixes to match backend logic

[LuisReyes98]

This pull request introduces several improvements and fixes related to the handling of inbound structures, particularly making the position field nullable to support services without a position structure. It also adds new converters for safer deserialization of dynamic maps and updates Flutter and DevTools configuration files. Below are the most important changes:

Inbound Structure Nullability and CopyWith Improvements

• Made the position field nullable (InboundPositionStructure? and InboundPositionStructureInput?) in InboundStructure and InboundStructureInput, including all relevant methods, constructors, and copyWith implementations, to support services that do not require a position structure. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21]

Deserialization and Converter Enhancements

• Added DynamicMapConverter and DynamicMapConverterNullable for safe deserialization of Map<dynamic, dynamic> to Map<String, dynamic>, and applied these to InboundService.credentials and InboundServiceInput.credentials to prevent failures when credentials are provided as empty map literals.

Flutter and Tooling Configuration

• Updated the Flutter version in .fvmrc from 3.41.8 to 3.41.9.
• Added configuration to devtools_options.yaml to disable drift and shared_preferences extensions by default.

Documentation

• Updated CHANGELOG.md to document the above changes as part of version 3.8.12.

[github-actions]

📋 Changelog Summary

This PR includes the following changes:

🐛 Bug Fixes

• InboundService fixes to match backend logic (5e9e34b by @LuisReyes98)

---

_{🤖 Auto-generated by changelog workflow}