Add inventory management templates and utility functions

- Created HTML templates for inventory index, layout, search, settings, table, user, and worklog.
- Implemented utility functions for eager loading relationships in SQLAlchemy.
- Added validation mixin for form submissions.
- Updated project configuration files (pyproject.toml and setup.cfg) for package management.

pyproject.toml

@@ -0,0 +1,21 @@
+[project]
+name = "inventory"
+version = "0.1.0"
+description = "A Flask app for tracking inventory."
+requires-python = ">=3.9"
+dependencies = [
+    "python-dotenv",
+    "flask",
+    "flask_sqlalchemy",
+    "pandas",
+    "pyodbc",
+    "beautifulsoup4",
+    "alembic"
+]
+
+[build-system]
+requires = ["setuptools"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+packages = ["inventory"]