fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

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

backend/game/__init__.py

@@ -0,0 +1,63 @@
+# ==============================================
+# Breakpilot Drive - Game Module
+# ==============================================
+# Database, quiz generation, and learning rules for the game.
+
+from .database import (
+    GameDatabase,
+    StudentLearningState,
+    GameSessionRecord,
+    GameQuizAnswer,
+    LearningLevel,
+    Achievement,
+    ACHIEVEMENTS,
+    get_game_db,
+)
+
+from .quiz_generator import (
+    QuizGenerator,
+    GeneratedQuestion,
+    Subject,
+    QuizMode,
+    get_quiz_generator,
+)
+
+from .learning_rules import (
+    LearningRuleEngine,
+    LearningRule,
+    LearningContext,
+    Suggestion,
+    ActionType,
+    RulePriority,
+    get_rule_engine,
+    calculate_level_adjustment,
+    get_subject_focus_recommendation,
+)
+
+__all__ = [
+    # Database
+    "GameDatabase",
+    "StudentLearningState",
+    "GameSessionRecord",
+    "GameQuizAnswer",
+    "LearningLevel",
+    "Achievement",
+    "ACHIEVEMENTS",
+    "get_game_db",
+    # Quiz Generator
+    "QuizGenerator",
+    "GeneratedQuestion",
+    "Subject",
+    "QuizMode",
+    "get_quiz_generator",
+    # Learning Rules
+    "LearningRuleEngine",
+    "LearningRule",
+    "LearningContext",
+    "Suggestion",
+    "ActionType",
+    "RulePriority",
+    "get_rule_engine",
+    "calculate_level_adjustment",
+    "get_subject_focus_recommendation",
+]