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/deadline_api.py

@@ -0,0 +1,79 @@
+"""
+Deadline API - Proxy zu Go Consent Service für Consent-Deadlines und Account-Sperrung
+"""
+
+from fastapi import APIRouter, HTTPException, Header
+from typing import Optional
+import httpx
+
+router = APIRouter(prefix="/v1", tags=["Deadlines"])
+
+CONSENT_SERVICE_URL = "http://localhost:8081"
+
+
+async def proxy_request(
+    method: str,
+    path: str,
+    authorization: Optional[str] = None,
+    json_data: dict = None
+):
+    """Proxy request to Go consent service."""
+    headers = {}
+    if authorization:
+        headers["Authorization"] = authorization
+
+    async with httpx.AsyncClient() as client:
+        try:
+            response = await client.request(
+                method,
+                f"{CONSENT_SERVICE_URL}{path}",
+                headers=headers,
+                json=json_data,
+                timeout=30.0
+            )
+
+            if response.status_code >= 400:
+                raise HTTPException(
+                    status_code=response.status_code,
+                    detail=response.json().get("error", "Request failed")
+                )
+
+            return response.json()
+        except httpx.RequestError as e:
+            raise HTTPException(status_code=503, detail=f"Consent service unavailable: {str(e)}")
+
+
+@router.get("/consent/deadlines")
+async def get_pending_deadlines(
+    authorization: Optional[str] = Header(None)
+):
+    """Holt alle ausstehenden Consent-Deadlines des Benutzers."""
+    return await proxy_request(
+        "GET",
+        "/api/v1/consent/deadlines",
+        authorization=authorization
+    )
+
+
+@router.get("/account/suspension-status")
+async def get_suspension_status(
+    authorization: Optional[str] = Header(None)
+):
+    """Gibt den Sperrstatus des Accounts zurück."""
+    return await proxy_request(
+        "GET",
+        "/api/v1/account/suspension-status",
+        authorization=authorization
+    )
+
+
+@router.post("/admin/deadlines/process")
+async def process_deadlines(
+    authorization: Optional[str] = Header(None)
+):
+    """Löst die Deadline-Verarbeitung manuell aus (nur Admin)."""
+    return await proxy_request(
+        "POST",
+        "/api/v1/admin/deadlines/process",
+        authorization=authorization
+    )