Add Ollama Client to User Interfaces

[Shishir435]

Adds one entry to User Interfaces, after Page Assist.

Ollama Client is an open-source (MIT) browser extension for chatting with locally hosted models. It runs as a sidepanel, so there is no server or container to host.

• Verified support for Ollama, LM Studio, and llama.cpp; any other OpenAI-compatible server can be added from settings.
• Local RAG over uploaded files with hybrid keyword + vector retrieval; chat history, files, and embeddings stay on the device.
• Reads the current tab, selected text, and open tabs as context for tool-capable models; optional web search.
• Published on the Chrome Web Store and Firefox Add-ons, actively maintained.