feat(ingestion): add first public LBA Serie A importer

app/scouting/management/commands/import_lba_public_serie_a.py

@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from django.core.management.base import BaseCommand, CommandError
+
+from scouting.importers.lba_public import (
+    LBA_SOURCE_NAME,
+    LbaFixtureStatsSource,
+    LbaPublicStatsSource,
+    LbaSerieAPublicImporter,
+    ImportValidationError,
+)
+
+
+class Command(BaseCommand):
+    help = "Import public LBA Serie A player statistics for one season using the ADR-0009 baseline flow."
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            "--season",
+            type=int,
+            default=2025,
+            help="Season start year to import from LBA public statistics API (default: 2025).",
+        )
+        parser.add_argument(
+            "--fixture",
+            default="",
+            help="Optional local fixture JSON path for deterministic/offline runs.",
+        )
+
+    def handle(self, *args, **options):
+        season_start_year = options["season"]
+        fixture_path = (options.get("fixture") or "").strip()
+
+        try:
+            if fixture_path:
+                source = LbaFixtureStatsSource(Path(fixture_path))
+                source_label = f"fixture={fixture_path}"
+            else:
+                source = LbaPublicStatsSource()
+                source_label = "public=https://www.legabasket.it/api/statistics/get-players-statistics"
+
+            summary = LbaSerieAPublicImporter(season_start_year=season_start_year, source=source).run()
+        except ImportValidationError as exc:
+            raise CommandError(f"LBA public import failed: {exc}") from exc
+
+        self.stdout.write(
+            self.style.SUCCESS(
+                "Imported LBA Serie A public statistics successfully. "
+                f"Source={LBA_SOURCE_NAME}; season={season_start_year}; "
+                f"players +{summary.players_created}/~{summary.players_updated}, "
+                f"teams +{summary.teams_created}/~{summary.teams_updated}, "
+                f"contexts +{summary.contexts_created}/~{summary.contexts_updated}."
+            )
+        )
+        self.stdout.write(f"Input: {source_label}")