fix(cmd): preserve protobuf raw descriptor blocks during template copy

[NepetaLemon]

Description (what this PR does / why we need it):

kratos new currently performs repository-wide string replacement when copying a template into a new project.

For .pb.go files generated by newer protoc-gen-go versions, the protobuf raw descriptor is emitted as a string literal block. Replacing the template module path inside that block can corrupt the embedded descriptor payload and cause generated projects to
panic during protobuf descriptor initialization.

This change preserves protobuf raw descriptor string blocks during template copy while keeping normal module-path replacement behavior for the rest of the file.

The change is backward-compatible with legacy generated files:

• newer string-literal raw descriptors are preserved
• legacy []byte raw descriptors continue to follow the existing replacement path

This PR also adds regression tests covering:

• protected replacement for string-literal raw descriptors
• normal replacement for non-generated content
• unchanged behavior for legacy []byte descriptor output

Which issue(s) this PR fixes (resolves / be part of):

part of #

Other special notes for the reviewers:

Validated with:

• go test ./internal/base ./internal/project under cmd/kratos
• a real kratos new run against a local ftgo-layout template

Affected protoc-gen-go range verified locally:

• v1.36.5 and earlier still emit []byte raw descriptors
• v1.36.6 through at least v1.36.11 emit string-literal raw descriptors

[Copilot]

Pull request overview

Updates kratos new template-copy behavior to avoid corrupting protobuf raw descriptor payloads in newer protoc-gen-go-generated .pb.go files where descriptors are emitted as concatenated string-literal blocks.

Changes:

• Add protobuf raw-descriptor block detection and skip module-path replacements within those blocks while still replacing elsewhere.
• Refactor replacement logic into replaceTemplateContent/applyReplacements.
• Add regression tests for preserving string-literal raw descriptors and keeping legacy []byte behavior unchanged.

Reviewed changes

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

File	Description
cmd/kratos/internal/base/path.go	Preserves matched protobuf raw descriptor string blocks during template copying while applying replacements to other content.
cmd/kratos/internal/base/path_test.go	Adds tests validating preservation of string-literal raw descriptors, full replacement when no raw desc exists, and legacy []byte behavior.

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