Add Deply architecture configuration

[Vashkatsi]

Summary

Adds an opt-in Deply baseline for the template's current pragmatic Active Record-style architecture and documents how to run it.

This does not claim Clean Architecture boundaries and changes no runtime code, CI, dependencies, or lockfiles. The commands select Python 3.14 explicitly because the template uses Python 3.14 syntax.

Related discussion: #2443

Verification

• Configuration validation passed.
• Analysis found 509 dependencies and 0 violations.
• Layers are pairwise disjoint: interface 29, data 25, infrastructure 18, bootstrap 6.
• deply.yaml matches the verified recipe byte-for-byte.
• YAML, EOF, and whitespace hooks passed.

Known check

typos treats Deply and deply as misspellings, including the filename. The clean fix is to allow both identifiers in the existing typos configuration. I left pyproject.toml unchanged because contributor policy reserves that file for maintainers.

[YuriiMotov]

Thanks, but I think we don't need this.

We are trying to keep things clean and ask to only open PRs when it's explicitly requested by maintainers.
See https://tiangolo.com/open-source/contributing/ and PR description template:

Please start with a GitHub Discussion.

Once a team member asks you to open a PR, create it and link the discussion here.

Thanks for understanding!