chore(release): Kanbante 0.2.0 — Docker, docs, licence

- Dockerfile: copie du code avant installation (le package installé
  n'est plus vide — I6), utilisateur non-root, HEALTHCHECK
- compose: version: obsolète retiré, variables d'auth, healthcheck
- pyproject: version 0.2.0, jinja2 <4, config pytest
- LICENSE (MIT), CHANGELOG 0.2.0, README réécrit (configuration,
  sécurité, API, tests), .dockerignore

pyproject.toml

@@ -1,12 +1,12 @@
 [project]
 name = "kanbante"
-version = "0.1.0"
+version = "0.2.0"
 description = "Kanban project manager integrated with Gitea"
 requires-python = ">=3.11"
 dependencies = [
     "fastapi>=0.115",
     "uvicorn[standard]>=0.32",
-    "jinja2>=3.1,<3.1.6",
+    "jinja2>=3.1,<4",
     "httpx>=0.28",
     "python-dotenv>=1.0",
     "python-multipart>=0.0.18",
@@ -20,3 +20,7 @@ dev = [
     "pytest>=8",
     "pytest-asyncio>=0.24",
 ]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+asyncio_mode = "auto"