[refactor] Split oversized infrastructure and application modules #177

Context

Two modules are oversized and mix responsibilities:

• infrastructure/creation_projects.py is 895 lines with 56 def/class and also acts as a command dispatcher, which is an application-layer responsibility.
• application/tool_operations.py is 873 lines.

Scope

• Split the modules by command/domain.
• Move the command-dispatch responsibility out of infrastructure and into the application layer.

Acceptance criteria

• Module size and responsibility converge to a maintainable level.
• The dispatcher lives in the application layer.
• The full test suite passes after the split.

Dependencies / notes

• Depends on the dependency-cycle issue ([refactor] Break the application <-> infrastructure dependency cycle #173).
• Static review baseline: commit a1ff887.