Feature Request: Add Agent Management Section and Group Models by Provider in Settings

Feature Request: Add Agent Management Section and Group Models by Provider in Settings

Agent Management System

Problem: The settings currently lack a dedicated section for managing agents (adding, editing, and configuring them). This makes the overall workflow and purpose of agents unclear to the user.

Proposed Solution: Add a new "Agents" section in the settings interface, implement full CRUD (Create, Read, Update, Delete) functionality for agents, and provide visual indicators showing how each agent operates within the system.

Model Grouping by Provider

Problem: The current flat list of models creates ambiguity when a user configures multiple providers offering the same model (e.g., running gpt-5.6 via both OpenAI and Azure). Distinguishing them purely by custom names is inefficient and prone to confusion.

Proposed Solution: Restructure the model selection UI into distinct blocks categorized by provider (e.g., OpenAI, Anthropic, Ollama, Azure) and group available models under their respective provider blocks to make source attribution clear.

---
| Field | Value |
| --- | --- |
| App version | 1.1.2 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Day 3 (Week 1) |

从设置界面开始，跟踪现有的模型选择 UI 和 provider 数据流。实现 Agents 部分的创建、读取、更新和删除行为以及运行模式指示器，然后将模型分组到特定于 provider 的区块中。完成的标准是可以在设置中管理 Agents，并且名称相同的模型仍能通过 provider 加以区分。

由索引模型根据 Issue 内容生成。