Add packaging metadata so python -m build works

#110 recorded pyproject.toml + __init__.py as verified on a real toolchain
but they were never committed; origin has nothing past d5203ce.

pyproject.toml is deliberately plain: the sidecar's pypi.ReadProjectMetadata
is a line scanner, not a TOML parser, and reads name and version as literal
single-line assignments under [project]. A dynamic version would break both
the publish check and the startup reconcile.

__init__.py re-exports the public API so src/i7lib is an importable package.
.gitignore keeps dist/ out of the tree — a committed wheel would travel in
gitea's source archive and trip the builder's one-wheel-in-dist check.

.gitignore

@@ -0,0 +1,5 @@
+dist/
+build/
+*.egg-info/
+__pycache__/
+*.pyc

pyproject.toml

@@ -0,0 +1,17 @@
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "i7lib"
+version = "0.1.0"
+description = "i7 library for scripts"
+readme = "README.md"
+requires-python = ">=3.8"
+dependencies = ["requests>=2.31"]
+
+[project.optional-dependencies]
+dotenv = ["python-dotenv>=1.0"]
+
+[tool.setuptools.packages.find]
+where = ["src"]

src/i7lib/__init__.py

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+from . import timeutils
+from .client import Plant, WriteBatch, run
+from .dbutils import Database
+
+__all__ = ["Database", "Plant", "WriteBatch", "run", "timeutils"]