Project detection CLI command

[Hey-Yetunde]

Problem

Operators can't run detection on a directory without importing it as a project.

Context

app/services/stellar_detection.py::detect_stellar_project accepts an iterable of file objects.

Technical requirements

• Add flask project detect-stellar <path> that walks a directory (respecting the project skip rules), builds file stubs, and prints detection results (confidence, evidence).
• Read-only; no DB changes.

Acceptance criteria

• A Soroban directory reports likely; a plain Rust directory reports none.

Testing requirements

• CLI test with temp directories.

Dependencies

• Detection (implemented).

Difficulty

Easy

Priority

Low