Initial commit: EifelDC - Discord-like Matrix chat platform

Includes server (Rust/Axum API proxy with voice management),
Tauri desktop client with Svelte UI, bot-sdk, Docker infra
(Synapse, PostgreSQL, Coturn, Nginx), and CI/CD pipeline.

infra/scripts/stop.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+INFRA_DIR="$(dirname "$SCRIPT_DIR")"
+
+if command -v docker &>/dev/null && [ -f "${INFRA_DIR}/docker-compose.yml" ]; then
+    echo "=== Stopping EifelDC Infrastructure (Docker) ==="
+    cd "${INFRA_DIR}"
+    docker compose down
+    echo "All containers stopped."
+else
+    echo "=== Stopping EifelDC Infrastructure (Native) ==="
+    sudo systemctl stop eifeldc-server 2>/dev/null || true
+    sudo systemctl stop eifeldc-synapse 2>/dev/null || true
+    sudo systemctl stop coturn 2>/dev/null || true
+    sudo systemctl stop nginx 2>/dev/null || true
+    echo "All services stopped."
+fi