Restructure: Move 43 files into 8 domain packages (backend-lehrer)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend-lehrer/game/api.py

@@ -0,0 +1,46 @@
+# ==============================================
+# Breakpilot Drive - Game API (barrel re-export)
+# ==============================================
+# This module was split into:
+#   - game_models.py          (Pydantic models, difficulty mapping, sample questions)
+#   - game_routes.py           (Core game routes: level, quiz, session, leaderboard)
+#   - game_extended_routes.py  (Phase 5: achievements, progress, parent, class)
+#
+# The `router` object is assembled here by including all sub-routers.
+# Importers that did `from game_api import router` continue to work.
+
+from fastapi import APIRouter
+
+from .routes import router as _core_router
+from .session_routes import router as _session_router
+from .extended_routes import router as _extended_router
+
+# Re-export models for any direct importers
+from .game_models import (  # noqa: F401
+    LearningLevel,
+    GameDifficulty,
+    QuizQuestion,
+    QuizAnswer,
+    GameSession,
+    SessionResponse,
+    DIFFICULTY_MAPPING,
+    SAMPLE_QUESTIONS,
+)
+
+# Re-export helpers/state for any direct importers
+from .routes import (  # noqa: F401
+    get_optional_current_user,
+    get_user_id_from_auth,
+    get_game_database,
+    _sessions,
+    _user_levels,
+    USE_DATABASE,
+    REQUIRE_AUTH,
+)
+
+# Assemble the combined router.
+# Both sub-routers use prefix="/api/game", so include without extra prefix.
+router = APIRouter()
+router.include_router(_core_router)
+router.include_router(_session_router)
+router.include_router(_extended_router)