refactor(cmd/gf): improve code structure for readability and maintainability

[hailaz]

Refactor the code structure to enhance readability and maintainability without altering functionality.

fixed #4750 #4757 #4767

另外使用gf init -r github.com/gogf/template-single my-project方式没有问题

合并后v2.10.2生效

[Copilot]

Pull request overview

This PR updates gf init project generation to preserve local template imports and refreshes the bundled templates used by the CLI, addressing initialization failures where generated projects could not compile due to missing v1 imports.

Changes:

• Replaces built-in template formatting with go/format via exported geninit.FormatGoFiles.
• Refreshes packed template resources for single, mono, and mono-app templates.
• Updates Makefile packing flow and uses perl for cross-platform template text replacement.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Makefile	Runs cmd/gf template packing during version updates.
cmd/gf/Makefile	Switches mono-app template replacement from sed to perl.
cmd/gf/internal/packed/template-single.go	Refreshes packed single-project template resource.
cmd/gf/internal/packed/template-mono.go	Refreshes packed mono-repo template resource.
cmd/gf/internal/packed/template-mono-app.go	Refreshes packed mono-app template resource.
cmd/gf/internal/cmd/geninit/geninit_generator.go	Exports FormatGoFiles and uses it during remote template generation.
cmd/gf/internal/cmd/cmd_init.go	Uses FormatGoFiles for built-in template generation to avoid goimports import rewriting.

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