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/auth/__init__.py

@@ -0,0 +1,55 @@
+"""
+BreakPilot Authentication Module
+
+Hybrid authentication supporting both Keycloak and local JWT tokens.
+"""
+
+from .keycloak_auth import (
+    # Config
+    KeycloakConfig,
+    KeycloakUser,
+
+    # Authenticators
+    KeycloakAuthenticator,
+    HybridAuthenticator,
+
+    # Exceptions
+    KeycloakAuthError,
+    TokenExpiredError,
+    TokenInvalidError,
+    KeycloakConfigError,
+
+    # Factory functions
+    get_keycloak_config_from_env,
+    get_authenticator,
+    get_auth,
+
+    # FastAPI dependencies
+    get_current_user,
+    require_role,
+)
+
+__all__ = [
+    # Config
+    "KeycloakConfig",
+    "KeycloakUser",
+
+    # Authenticators
+    "KeycloakAuthenticator",
+    "HybridAuthenticator",
+
+    # Exceptions
+    "KeycloakAuthError",
+    "TokenExpiredError",
+    "TokenInvalidError",
+    "KeycloakConfigError",
+
+    # Factory functions
+    "get_keycloak_config_from_env",
+    "get_authenticator",
+    "get_auth",
+
+    # FastAPI dependencies
+    "get_current_user",
+    "require_role",
+]