docs: align pyproject description with the GitHub description (#62)

Part of an org-wide metadata-consistency sweep: the GitHub description,
pyproject description, and profile blurb now carry one canonical one-liner.
The GitHub wording (the most complete) is canonical for this template.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: lesnik512

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "fastapi-sqlalchemy-template"
 version = "0"
-description = "Async template on FastAPI and SQLAlchemy 2"
+description = "Dockerized FastAPI + SQLAlchemy 2 + PostgreSQL app template with DI"
 readme = "readme.md"
 requires-python = ">=3.14"
 authors = [