Update OpenAI and Google models

[Medenor]

This pull request introduces updates to the project's AI model integration and default configurations.

Key Changes:

• api.py Update: The default model for API calls has been switched to Google Gemini-2.5-flash. This change aims to leverage the latest advancements and potentially improved performance, cost-efficiency, or feature set offered by Gemini-2.5-flash, making it the primary model used for new requests unless otherwise specified.
• generator.json Update: This file has been updated to include the latest available models from both OpenAI and Google. This ensures that the application can utilize the newest and most capable models from these providers, potentially offering better results, new functionalities, or access to models that have superseded older versions. This update may involve adding new model IDs, adjusting parameters for existing models, or removing support for deprecated models.
• README Update: all README files have been updated accordingly.

Purpose:

These updates ensure the application remains current with the rapidly evolving landscape of large language models, providing users with access to state-of-the-art AI capabilities and optimizing the default experience for performance and relevance.

[gemini-code-assist]

Summary of Changes

Hello @Medenor, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the application's integration with OpenAI and Google AI models to ensure it remains current with the latest advancements. It primarily focuses on updating default model configurations and adding support for newer model versions across different providers, along with synchronizing documentation.

Highlights

• Google Model Updates: The default Google model has been updated to "gemini-2.5-flash" in both the API configuration and the "generator.json" file. Support for "gemini-2.5-flash-lite" and "gemini-2.5-pro" has also been added.
• OpenAI Model Updates: The default OpenAI model has been changed to "gpt-5-nano" in "generator.json", and new models "gpt-5-nano" and "gpt-5-mini" have been added to the supported list.
• OpenRouter Default Model: The default model for OpenRouter has been updated to "openai/gpt-5-nano".
• Documentation Synchronization: All README files across various languages have been updated to reflect the new default Google and OpenAI models.

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[gemini-code-assist]

Code Review

This pull request updates the default and available AI models from Google and OpenAI across the application. The default model is now gemini-2.5-flash for Google and gpt-5-nano for OpenAI. The configuration files and all READMEs have been updated to reflect these changes. The changes are mostly correct and align with the goal of using newer models. I've found a minor formatting issue in the JSON configuration that should be addressed for consistency.