Initial toni-sync CLI: sync local playlist folders to Kreativ-Tonies

- Config commands (config add/list/remove) to map local audio folders
  to Kreativ-Tonies via TonieCloud household/tonie ids
- tonies list command to look up household/tonie ids
- sync command: diff-based upload of new tracks, pruning of removed
  chapters, and reordering to match local file order (via tonie-api)
- Credentials resolved via env vars/CLI flags/prompt, never stored
- Unit tests for config persistence and sync planning/apply logic

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

pyproject.toml

@@ -0,0 +1,28 @@
+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "toni-sync"
+version = "0.1.0"
+description = "CLI tool to sync local audio folders (e.g. exported Deezer playlists) to Kreativ-Tonies via the TonieCloud API."
+readme = "README.md"
+requires-python = ">=3.10"
+license = { text = "MIT" }
+dependencies = [
+    "click>=8.1",
+    "pydantic>=2.0",
+    "PyYAML>=6.0",
+    "tonie-api>=0.1.2",
+]
+
+[project.scripts]
+toni-sync = "toni_sync.cli:cli"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0",
+]