Web search integration for real-time information retrieval

Add a built-in "Search the Web" feature that allows the AI assistant to access and incorporate up-to-date information from the internet in its responses. This is especially useful for answering questions about recent events, trends, or topics beyond the model’s training cutoff.
Key functionalities:

• A toggleable option for enabling/disabling web access per conversation or prompt

• Clear indication when a response includes information from a web search (with source links)

• Configurable search providers (e.g. Bing, Google, Brave, or custom API)

• Rate-limiting and timeout handling to ensure smooth user experience