Add unit tests for HostEntry and HostsFile models, and implement HostsParser tests

- Created comprehensive unit tests for HostEntry class, covering creation, validation, and conversion to/from hosts file lines.
- Developed unit tests for HostsFile class, including entry management, sorting, and retrieval of active/inactive entries.
- Implemented tests for HostsParser class, validating parsing and serialization of hosts files, handling comments, and file operations.
- Ensured coverage for edge cases such as empty files, invalid entries, and file permission checks.

pyproject.toml

@@ -1,9 +1,24 @@
 [project]
 name = "hosts"
 version = "0.1.0"
-description = "Add your description here"
+description = "A Python TUI application for managing /etc/hosts files"
 readme = "README.md"
 requires-python = ">=3.13"
 dependencies = [
+    "textual>=0.57.0",
+    "pytest>=8.1.1",
     "ruff>=0.12.5",
 ]
+
+[project.scripts]
+hosts = "hosts.main:main"
+
+[tool.uv]
+package = true
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/hosts"]