refactor(project): move creation logic into shop package

[Soner (shyim)]

Summary

• add ShopwareProjectScaffold in internal/shop for composer, filesystem, deployment, and CI scaffolding
• centralize project-name and folder validation, supported deployment/CI checks, version filtering, and version resolution
• normalize scaffold defaults and enforce Shopware PaaS Elasticsearch requirements
• move embedded scaffold templates and their tests out of cmd/project
• reduce the Cobra command layer to CLI parsing, interaction, telemetry, environment checks, and orchestration

Why

Reusable project-creation behavior lived in the CLI package, which made it difficult to exercise independently and allowed non-CLI callers to bypass validation. Keeping the project contract in internal/shop makes the behavior directly testable and ensures the scaffold validates its target before writing files.

Impact

Direct scaffold callers now receive the same validation and normalization as the CLI. In particular, unsupported deployment or CI values are rejected, non-empty project directories are protected from overwrite, and Shopware PaaS consistently enables Elasticsearch.

Validation

• go test ./...
• focused coverage for the extracted validation and version-selection APIs

[Soner (shyim)]

Copilot resolve the merge conflicts in this pull request

[Copilot]

Copilot resolve the merge conflicts in this pull request

Resolved in 2c368ca.

[Codecov Comments Bot (codecov-commenter)]

Codecov Report

❌ Patch coverage is 76.92308% with 45 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.96%. Comparing base (b9fd35b) to head (2c368ca).

Files with missing lines	Patch %	Lines
internal/shop/project_scaffold.go	87.09%	12 Missing ⚠️
cmd/project/project_create_form.go	0.00%	10 Missing ⚠️
cmd/project/project_create_scaffold.go	0.00%	9 Missing ⚠️
cmd/project/project_create_validate.go	0.00%	9 Missing ⚠️
cmd/project/project_create.go	62.50%	3 Missing ⚠️
internal/shop/project_creation.go	96.96%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1227      +/-   ##
==========================================
+ Coverage   52.70%   52.96%   +0.25%     
==========================================
  Files         298      300       +2     
  Lines       23068    23108      +40     
==========================================
+ Hits        12158    12238      +80     
+ Misses      10910    10870      -40     

Flag	Coverage Δ
go-test	52.96% <76.92%> (+0.25%)	⬆️

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