feat(cli,display): add --health check and repo description column

Add --health option to verify Gitea connectivity and display version.
Add Description column (truncated at 40 chars) with --no-desc to hide
it. Add get_version() method to GiteaClient.

fixes #14
fixes #15

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/gitea_dashboard/cli.py

@@ -59,9 +59,35 @@ def parse_args(argv: list[str] | None = None) -> argparse.Namespace:
         dest="format",
         help="Format de sortie (defaut: table).",
     )
+    parser.add_argument(
+        "--health",
+        action="store_true",
+        default=False,
+        help="Verifie la connexion Gitea et affiche la version. Exit 0 si OK, 1 sinon.",
+    )
+    parser.add_argument(
+        "--no-desc",
+        action="store_true",
+        default=False,
+        help="Masque la colonne Description dans le tableau.",
+    )
     return parser.parse_args(argv)
 
 
+def _run_health_check(client: GiteaClient, console: Console) -> None:
+    """Execute le health check et affiche les resultats.
+
+    1. Appelle client.get_version() -> affiche "Gitea vX.Y.Z"
+    2. Appelle client.get_repos() -> affiche "N repos accessibles"
+    """
+    version_info = client.get_version()
+    version = version_info.get("version", "inconnue")
+    console.print(f"Gitea v{version}")
+
+    repos = client.get_repos()
+    console.print(f"{len(repos)} repos accessibles")
+
+
 def main(argv: list[str] | None = None) -> None:
     """Point d'entree principal.
 
@@ -90,6 +116,10 @@ def main(argv: list[str] | None = None) -> None:
     client = GiteaClient(url, token)
 
     try:
+        if args.health:
+            _run_health_check(client, console)
+            return
+
         repos = collect_all(client, include=args.repo, exclude=args.exclude)
     except requests.ConnectionError:
         console.print("[red]Erreur : connexion refusee. Verifiez l'URL et le serveur Gitea.[/red]")
@@ -111,4 +141,4 @@ def main(argv: list[str] | None = None) -> None:
         sorted_repos = sort_repos(repos, args.sort)
         print(export_json(sorted_repos))  # noqa: T201
     else:
-        render_dashboard(repos, sort_key=args.sort)
+        render_dashboard(repos, sort_key=args.sort, show_description=not args.no_desc)