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.

client/scripts/build-macos.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+
+TARGET="${1:-}"
+if [ -n "$TARGET" ]; then
+    TARGET_ARG="--target $TARGET"
+else
+    TARGET_ARG=""
+fi
+
+echo "=== Building EifelDC for macOS ==="
+echo "Target: ${TARGET:-native}"
+
+echo "[1/3] Installing frontend dependencies..."
+cd "${PROJECT_DIR}/client/src-ui"
+npm ci
+
+echo "[2/3] Building frontend..."
+npm run build
+
+echo "[3/3] Building Tauri app..."
+cd "${PROJECT_DIR}/client"
+cargo tauri build $TARGET_ARG
+
+echo ""
+echo "=== Build complete! ==="
+
+if [ -n "$TARGET" ]; then
+    BUNDLE_DIR="${PROJECT_DIR}/client/src-tauri/target/${TARGET}/release/bundle"
+else
+    BUNDLE_DIR="${PROJECT_DIR}/client/src-tauri/target/release/bundle"
+fi
+
+if [ -d "${BUNDLE_DIR}/dmg" ]; then
+    echo "DMG: $(find "${BUNDLE_DIR}/dmg" -name '*.dmg' 2>/dev/null || echo 'not found')"
+fi
+if [ -d "${BUNDLE_DIR}/macos" ]; then
+    echo "App: $(find "${BUNDLE_DIR}/macos" -name '*.app' 2>/dev/null || echo 'not found')"
+fi