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/classroom_engine/__init__.py

@@ -0,0 +1,91 @@
+"""
+Classroom Engine - State Machine fuer Unterrichtsphasen
+
+Dieses Package implementiert eine Finite State Machine fuer die
+Steuerung von Unterrichtsstunden mit 5 Phasen:
+
+1. Einstieg (8 Min) - Motivation, Problemstellung
+2. Erarbeitung (20 Min) - Hauptarbeitsphase
+3. Sicherung (10 Min) - Ergebnisse festhalten
+4. Transfer (7 Min) - Anwendung
+5. Reflexion (5 Min) - Rueckblick, Hausaufgaben
+
+Features:
+- Phasen-Timer mit Countdown und Warnungen
+- Phasenspezifische Content-Vorschlaege
+- Session-History fuer Analytics
+"""
+
+from .models import (
+    LessonPhase,
+    PhaseConfig,
+    LessonSession,
+    LessonTemplate,
+    PhaseSuggestion,
+    Homework,
+    HomeworkStatus,
+    PhaseMaterial,
+    MaterialType,
+    LESSON_PHASES,
+    SYSTEM_TEMPLATES,
+    get_default_durations,
+)
+from .fsm import LessonStateMachine
+from .timer import PhaseTimer
+from .suggestions import SuggestionEngine, PHASE_SUGGESTIONS, SUBJECT_SUGGESTIONS
+from .context_models import (
+    MacroPhaseEnum,
+    EventTypeEnum,
+    EventStatusEnum,
+    RoutineTypeEnum,
+    RecurrencePatternEnum,
+    TeacherContextDB,
+    SchoolyearEventDB,
+    RecurringRoutineDB,
+    FEDERAL_STATES,
+    SCHOOL_TYPES,
+)
+from .antizipation import (
+    SignalCollector,
+    RuleEngine,
+    SuggestionGenerator,
+    Signals,
+    Suggestion,
+    SuggestionTone,
+    ActiveContext,
+    ContextType,
+)
+from .analytics import LessonReflection
+
+__all__ = [
+    "LessonPhase",
+    "PhaseConfig",
+    "LessonSession",
+    "LessonTemplate",
+    "PhaseSuggestion",
+    "Homework",
+    "HomeworkStatus",
+    "PhaseMaterial",
+    "MaterialType",
+    "LESSON_PHASES",
+    "SYSTEM_TEMPLATES",
+    "get_default_durations",
+    "LessonStateMachine",
+    "PhaseTimer",
+    "SuggestionEngine",
+    "PHASE_SUGGESTIONS",
+    "SUBJECT_SUGGESTIONS",
+    # Phase 8: Schuljahres-Kontext
+    "MacroPhaseEnum",
+    "EventTypeEnum",
+    "EventStatusEnum",
+    "RoutineTypeEnum",
+    "RecurrencePatternEnum",
+    "TeacherContextDB",
+    "SchoolyearEventDB",
+    "RecurringRoutineDB",
+    "FEDERAL_STATES",
+    "SCHOOL_TYPES",
+    # Analytics
+    "LessonReflection",
+]