Feature: Apply profile settings on the fly

[ilukashin]

Concept

Allow user to send requests to specific model-profile setup without reloading model.

How it works

Given:
qwen3 - original model name, installed with oMLX.

In model settings it have two profiles with specific settings:

• code profile with thinking=off, temperature = 0.1
• chat profile with thinking=on
• alias = my_favorite_model

Then:
When i write client config, in model name i can provide values like:

qwen3:code
qwen3:chat
my_favorite_model:code
my_favorite_model:chat

UI changes

Added dropdown if model have profiles. Inspired by #341.

TODO

• Check test coverage for future regression
• Update README for different languages
• Add settings specified for each profile on its row (UI)