docs: Architekturplan, ADRs, Spezifikationen und Umsetzungsplan

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.env.example

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+# Kopieren nach .env – niemals committen.
+# Router-Service
+KNASTER_API_TOKEN=change-me
+KNASTER_DB_URL=postgresql+psycopg://knaster:change-me@postgres:5432/knaster
+KNASTER_SITE_DIR=/app/sites/knaster
+KNASTER_SKILLS_DIR=/app/skills
+KNASTER_CONFIG_DIR=/app/config
+KNASTER_DRY_RUN=true
+
+# LiteLLM-Gateway
+LITELLM_BASE_URL=http://litellm:4000
+LITELLM_API_KEY=change-me
+LITELLM_MASTER_KEY=change-me
+OPENROUTER_API_KEY=
+RERANK_URL=http://gpu-embed:8081
+
+# Healer-Treiber
+PORTAINER_HOST=
+PORTAINER_KEY=
+PROXMOX_URL=https://pve.example:8006
+PROXMOX_TOKEN_ID=knaster@pve!healer
+PROXMOX_TOKEN_SECRET=
+NOTIFY_WEBHOOK_URL=
+
+# n8n (nur für Import/Tests)
+N8N_HOST=
+N8N_API_KEY=