[BACKEND] Initialize Go backend structure and dependencies (#23)

scripts/docker-entrypoint.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# ============================================
+# Chat Switchboard - Backend Launcher
+# ============================================
+# Runs as an nginx entrypoint.d hook.
+# Starts the Go backend in the background
+# before nginx begins accepting connections.
+# ============================================
+
+set -e
+
+echo "🔀 Starting Chat Switchboard backend..."
+
+# Launch Go backend in background
+/usr/local/bin/switchboard &
+BACKEND_PID=$!
+
+# Wait for backend to be ready (max 10s)
+for i in $(seq 1 20); do
+    if wget -q --spider http://localhost:${PORT:-8080}/health 2>/dev/null; then
+        echo "✅ Backend ready (PID ${BACKEND_PID})"
+        exit 0
+    fi
+    sleep 0.5
+done
+
+echo "❌ Backend failed to start within 10s"
+exit 1