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>

scripts/env-switch.sh

@@ -0,0 +1,91 @@
+#!/bin/bash
+# ============================================
+# BreakPilot Environment Switcher
+# ============================================
+# Usage: ./scripts/env-switch.sh [dev|staging|prod]
+# ============================================
+
+set -e
+
+ENV=${1:-dev}
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ROOT_DIR="$(dirname "$SCRIPT_DIR")"
+
+# Colors
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+RED='\033[0;31m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+cd "$ROOT_DIR"
+
+case $ENV in
+    dev|development)
+        ENV_FILE=".env.dev"
+        ENV_NAME="Development"
+        COLOR=$GREEN
+        ;;
+    staging)
+        ENV_FILE=".env.staging"
+        ENV_NAME="Staging"
+        COLOR=$YELLOW
+        ;;
+    prod|production)
+        ENV_FILE=".env.prod"
+        ENV_NAME="Production"
+        COLOR=$RED
+        echo -e "${RED}========================================${NC}"
+        echo -e "${RED}  WARNING: Production environment!${NC}"
+        echo -e "${RED}========================================${NC}"
+        read -p "Are you sure? (yes/no): " CONFIRM
+        if [ "$CONFIRM" != "yes" ]; then
+            echo "Aborted."
+            exit 0
+        fi
+        ;;
+    *)
+        echo -e "${RED}Unknown environment: $ENV${NC}"
+        echo ""
+        echo "Usage: $0 [dev|staging|prod]"
+        echo ""
+        echo "Available environments:"
+        echo "  dev      - Development (default)"
+        echo "  staging  - Staging/Testing"
+        echo "  prod     - Production (use with caution!)"
+        exit 1
+        ;;
+esac
+
+# Check if env file exists
+if [ ! -f "$ENV_FILE" ]; then
+    if [ -f ".env.example" ]; then
+        echo -e "${YELLOW}Creating $ENV_FILE from .env.example...${NC}"
+        cp .env.example "$ENV_FILE"
+        echo -e "${YELLOW}Please edit $ENV_FILE with appropriate values.${NC}"
+    else
+        echo -e "${RED}Error: $ENV_FILE not found and no .env.example available.${NC}"
+        exit 1
+    fi
+fi
+
+# Copy to .env
+echo -e "${COLOR}Switching to $ENV_NAME environment...${NC}"
+cp "$ENV_FILE" .env
+
+echo -e "${GREEN}✓ Environment switched to: $ENV_NAME${NC}"
+echo ""
+echo "To start services:"
+case $ENV in
+    dev|development)
+        echo "  docker compose up -d"
+        ;;
+    staging)
+        echo "  docker compose -f docker-compose.yml -f docker-compose.staging.yml up -d"
+        echo "  Or: ./scripts/start.sh staging"
+        ;;
+    prod|production)
+        echo "  docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d"
+        echo "  Or: ./scripts/start.sh prod"
+        ;;
+esac