[STYLE] Simplify `RegisterModel` Function in App

[YidiDev]

Description

The RegisterModel function in internal/adminpanel/app.go has a cyclomatic complexity of 84, far exceeding the recommended standard.

Location

• File: internal/adminpanel/app.go
• Line number(s): 34

Expected Style

Adherence to a cyclomatic complexity of 15 or below according to project standards.

Current Style

The current complexity of 84 suggests excessive decision-making processes embedded in the function.

Additional Context

High complexity indicates a potential need for significant design change.

Suggestions for Improvement

Refactoring could involve splitting the logic across multiple functions, simplifying loops, or using early returns to reduce nesting.

Environment

All development environments

Checklist

• I have checked if this style is mentioned in the project's style guide.
• I have checked previous issues for similar stylistic concerns.

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