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

@@ -1,46 +1,4 @@
-# ==============================================
-# 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 game_routes import router as _core_router
-from game_session_routes import router as _session_router
-from game_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 game_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)
+# Backward-compat shim -- module moved to game/api.py
+import importlib as _importlib
+import sys as _sys
+_sys.modules[__name__] = _importlib.import_module("game.api")