feat(cli): add --repo and --exclude filtering (fixes #5)

Add argparse-based CLI parsing with repeatable --repo/-r (include) and
--exclude/-x (exclude) options. Filtering is case-insensitive substring
matching, applied post-fetch in collect_all() per ADR-005.

- parse_args() separated from main() for testability
- main(argv=None) accepts argv for test injection
- collect_all() gains optional include/exclude parameters
- 14 new tests (8 filtering + 6 CLI parsing/integration)
- All 51 tests pass, backward compatible (no args = v1.0.0 behavior)

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

src/gitea_dashboard/collector.py

@@ -22,13 +22,37 @@ class RepoData:
     milestones: list[dict]  # [{title, open_issues, closed_issues, due_on}]
 
 
-def collect_all(client: GiteaClient) -> list[RepoData]:
-    """Collecte les donnees de tous les repos.
+def _matches_any(name: str, patterns: list[str]) -> bool:
+    """Return True if name contains any of the patterns (case-insensitive)."""
+    name_lower = name.lower()
+    return any(p.lower() in name_lower for p in patterns)
 
-    Pour chaque repo : enrichit avec release et milestones.
-    Calcule open_issues = open_issues_count - open_pr_counter.
+
+def collect_all(
+    client: GiteaClient,
+    include: list[str] | None = None,
+    exclude: list[str] | None = None,
+) -> list[RepoData]:
+    """Collecte les donnees des repos, avec filtrage optionnel.
+
+    Args:
+        client: Client API Gitea.
+        include: Si fourni, ne garde que les repos dont le nom contient
+                 au moins une des sous-chaines (insensible a la casse).
+        exclude: Si fourni, exclut les repos dont le nom contient
+                 au moins une des sous-chaines (insensible a la casse).
+
+    Ordre d'application : include d'abord (si present), puis exclude.
+    Si include est None ou vide, tous les repos sont inclus avant l'etape exclude.
     """
     repos = client.get_repos()
+
+    # Filtrage post-fetch : l'API Gitea ne supporte pas le filtre par nom
+    if include:
+        repos = [r for r in repos if _matches_any(r["name"], include)]
+    if exclude:
+        repos = [r for r in repos if not _matches_any(r["name"], exclude)]
+
     result: list[RepoData] = []
 
     for repo in repos: