Fix: enhance driver handling and improve query formatting

[lwnmengjing]

Description

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (main)
• no unintentional fmt.Print left behind after debugging
• did I name variables, methods and classes according to the naming rules? (https://go.dev/doc/effective_go#names)
• caught exceptions or throw them to the upper level for processing, not ignored (https://go.dev/doc/effective_go#errors)
• did I explain all possible solutions and why I chose the one I did?
• added any comments to make new functions clearer
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated
• I have run the project locally and verified that there are no errors
• instructions for how reviewers can test the code locally
• screenshot of the feature/bug fix (if applicable)

[Copilot]

Pull Request Overview

This PR enhances driver handling in the database configuration and improves SQL query column formatting. The changes aim to fix issues related to driver assignment and ensure proper column qualification in SQL queries.

• Sets the global driver variable in the gorms package based on database configuration
• Reorders column formatting logic to ensure proper table qualification when table names are present

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
pkg/config/gormdb/gorm.go	Adds driver assignment logic to set the global gorms.Driver variable based on configuration
pkg/search/gorms/query.go	Reorders column formatting to ensure table prefix is applied correctly when table names are specified

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