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/ai_processor/__init__.py

@@ -0,0 +1,106 @@
+"""
+AI Processor Module
+
+A modular AI-powered worksheet processing system for:
+- Vision-based analysis
+- Content generation (MC, Cloze, Q&A)
+- Print version export
+- Mindmap visualization
+
+Usage:
+    from ai_processor import analyze_scan_structure_with_ai, generate_mc_from_analysis
+"""
+
+# Configuration
+from .config import (
+    BASE_DIR,
+    EINGANG_DIR,
+    BEREINIGT_DIR,
+    VISION_API,
+    get_openai_api_key,
+    get_anthropic_api_key,
+    ensure_directories,
+)
+
+# Utilities
+from .utils import (
+    encode_image_to_data_url,
+    encode_image_to_base64,
+    dummy_process_scan,
+    get_media_type,
+)
+
+# Vision - Scan Analysis
+from .vision import (
+    analyze_scan_structure_with_ai,
+    describe_scan_with_ai,
+    remove_handwriting_from_scan,
+    build_clean_html_from_analysis,
+)
+
+# Generators
+from .generators import (
+    generate_mc_from_analysis,
+    generate_cloze_from_analysis,
+    generate_qa_from_analysis,
+    update_leitner_progress,
+    get_next_review_items,
+)
+
+# Export - Print Versions
+from .export import (
+    generate_print_version_qa,
+    generate_print_version_cloze,
+    generate_print_version_mc,
+    generate_print_version_worksheet,
+)
+
+# Visualization - Mindmap
+from .visualization import (
+    generate_mindmap_data,
+    generate_mindmap_html,
+    save_mindmap_for_worksheet,
+)
+
+# Legacy aliases for backward compatibility
+_get_api_key = get_openai_api_key
+_encode_image_to_data_url = encode_image_to_data_url
+
+__all__ = [
+    # Config
+    "BASE_DIR",
+    "EINGANG_DIR",
+    "BEREINIGT_DIR",
+    "VISION_API",
+    "get_openai_api_key",
+    "get_anthropic_api_key",
+    "ensure_directories",
+    # Utils
+    "encode_image_to_data_url",
+    "encode_image_to_base64",
+    "dummy_process_scan",
+    "get_media_type",
+    # Vision
+    "analyze_scan_structure_with_ai",
+    "describe_scan_with_ai",
+    "remove_handwriting_from_scan",
+    "build_clean_html_from_analysis",
+    # Generators
+    "generate_mc_from_analysis",
+    "generate_cloze_from_analysis",
+    "generate_qa_from_analysis",
+    "update_leitner_progress",
+    "get_next_review_items",
+    # Export
+    "generate_print_version_qa",
+    "generate_print_version_cloze",
+    "generate_print_version_mc",
+    "generate_print_version_worksheet",
+    # Visualization
+    "generate_mindmap_data",
+    "generate_mindmap_html",
+    "save_mindmap_for_worksheet",
+    # Legacy aliases
+    "_get_api_key",
+    "_encode_image_to_data_url",
+]