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/pyproject.toml

@@ -0,0 +1,36 @@
+[project]
+name = "breakpilot-backend"
+version = "1.0.0"
+description = "BreakPilot Backend - FastAPI Server"
+requires-python = ">=3.10"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+asyncio_mode = "auto"
+# Add current directory to PYTHONPATH so local packages like classroom_engine are found
+pythonpath = ["."]
+# Define custom markers
+markers = [
+    "integration: marks tests as integration tests (require external services)",
+    "requires_postgres: marks tests that require PostgreSQL database",
+    "requires_weasyprint: marks tests that require WeasyPrint system libraries",
+]
+# Filter specific warnings
+filterwarnings = [
+    "ignore::DeprecationWarning",
+    "ignore::pytest.PytestUnraisableExceptionWarning",
+]
+
+[tool.coverage.run]
+source = ["."]
+omit = ["tests/*", "venv/*", "*/__pycache__/*"]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "if __name__ == .__main__.:",
+    "raise NotImplementedError",
+]