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>

.env.dev

@@ -0,0 +1,115 @@
+# ============================================
+# BreakPilot PWA - DEVELOPMENT Environment
+# ============================================
+# Usage: cp .env.dev .env
+# Or: ./scripts/env-switch.sh dev
+# ============================================
+
+# ============================================
+# Environment Identifier
+# ============================================
+ENVIRONMENT=development
+COMPOSE_PROJECT_NAME=breakpilot-dev
+
+# ============================================
+# HashiCorp Vault (Secrets Management)
+# ============================================
+# In development, use the local Vault instance with dev token
+VAULT_ADDR=http://localhost:8200
+VAULT_DEV_TOKEN=breakpilot-dev-token
+
+# ============================================
+# Database
+# ============================================
+POSTGRES_USER=breakpilot
+POSTGRES_PASSWORD=breakpilot_dev_123
+POSTGRES_DB=breakpilot_dev
+DATABASE_URL=postgres://breakpilot:breakpilot_dev_123@postgres:5432/breakpilot_dev?sslmode=disable
+
+# Synapse DB (Matrix)
+SYNAPSE_DB_PASSWORD=synapse_dev_123
+
+# ============================================
+# Authentication
+# ============================================
+# Development only - NOT for production!
+JWT_SECRET=dev-jwt-secret-not-for-production-32chars
+JWT_REFRESH_SECRET=dev-refresh-secret-32chars-change-me
+
+# ============================================
+# Service URLs (Development)
+# ============================================
+FRONTEND_URL=http://localhost:8000
+BACKEND_URL=http://localhost:8000
+CONSENT_SERVICE_URL=http://localhost:8081
+BILLING_SERVICE_URL=http://localhost:8083
+SCHOOL_SERVICE_URL=http://localhost:8084
+KLAUSUR_SERVICE_URL=http://localhost:8086
+WEBSITE_URL=http://localhost:3000
+
+# ============================================
+# E-Mail (Mailpit for Development)
+# ============================================
+# Mailpit catches all emails - view at http://localhost:8025
+SMTP_HOST=mailpit
+SMTP_PORT=1025
+SMTP_USERNAME=
+SMTP_PASSWORD=
+SMTP_FROM_NAME=BreakPilot Dev
+SMTP_FROM_ADDR=dev@breakpilot.local
+
+# ============================================
+# MinIO (Object Storage)
+# ============================================
+MINIO_ROOT_USER=breakpilot_dev
+MINIO_ROOT_PASSWORD=breakpilot_dev_123
+MINIO_ENDPOINT=localhost:9000
+
+# ============================================
+# Qdrant (Vector DB)
+# ============================================
+QDRANT_URL=http://localhost:6333
+
+# ============================================
+# API Keys (Optional for Dev)
+# ============================================
+# Leave empty for offline development
+# Or add your test keys here
+ANTHROPIC_API_KEY=
+ANTHROPIC_DEFAULT_MODEL=claude-sonnet-4-20250514
+ANTHROPIC_ENABLED=false
+
+VAST_API_KEY=
+VAST_INSTANCE_ID=
+CONTROL_API_KEY=
+VAST_AUTO_SHUTDOWN=true
+VAST_AUTO_SHUTDOWN_MINUTES=30
+
+VLLM_BASE_URL=
+VLLM_ENABLED=false
+
+# ============================================
+# Embedding Configuration
+# ============================================
+# "local" = sentence-transformers (no API key needed)
+# "openai" = OpenAI API (requires OPENAI_API_KEY)
+EMBEDDING_BACKEND=local
+
+# ============================================
+# Stripe (Billing - Test Mode)
+# ============================================
+STRIPE_SECRET_KEY=
+STRIPE_PUBLISHABLE_KEY=
+STRIPE_WEBHOOK_SECRET=
+
+# ============================================
+# Debug Settings
+# ============================================
+DEBUG=true
+GIN_MODE=debug
+LOG_LEVEL=debug
+
+# ============================================
+# Jitsi (Video Conferencing)
+# ============================================
+JITSI_PUBLIC_URL=http://localhost:8443