Dev local api

[haonan-li]

Change Log

1. API Key Handling: Transitioned from creating key files via copying to dynamically reading all API keys from a YAML file, streamlining configuration processes.
2. Unified Configuration Dictionary: Replaced platform-specific dictionaries with a unified dictionary that aligns with environmental variable naming conventions, enhancing consistency and maintainability.
3. Model Switching: Introduced a --model parameter that allows switching between different models, currently supporting OpenAI and Anthropic.
4. Modular Architecture: Restructured the codebase into one Base class file and individual class files for each model, enhancing modularity and clarity.
5. Base Class Redefinition: Redefined the Base class to abstract asynchronous operations and other functionalities. Users customizing models need only override three functions.
6. Prompt Switching: Added a --prompt parameter for switching between predefined prompts, initially supporting prompts for OpenAI and Anthropic.
7. Prompt Definitions via YAML and JSON: Enabled prompt definitions using YAML and JSON, allowing prompts to be automatically read from corresponding YAML or JSON files when the prompt parameter ends with .yaml or .json.
8. Search Engine Switching: Introduced a --retriever parameter to switch between different search engines, currently supporting Serper and Google.
9. Webapp Frontend Optimization: Optimized the web application frontend to prevent duplicate requests during processing, including disabling the submit button after a click and displaying a timer during processing.
   10 Client Switching: introduce a --client parameter that allows switching between different client (chat API), currently support OpenAI compatible API (for local model and official model), and Anthropic chat API client.