feat: add CodiMD database port-forward helper scripts

Add three scripts to simplify CodiMD database access via port-forward:
- db-port-forward.sh: Start SSH tunnel and kubectl port-forward
- db-port-forward-stop.sh: Stop port-forward processes
- db-status.sh: Check port-forward status

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/codimd/db-status.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# 檢查 CodiMD 資料庫 Port Forward 狀態
+
+echo "=== CodiMD 資料庫 Port Forward 狀態 ==="
+
+if pgrep -f "port-forward.*codimd-db" > /dev/null; then
+    PIDS=$(pgrep -f "port-forward.*codimd-db")
+    echo "✅ Port-forward 正在運行"
+    echo "   PID(s): $PIDS"
+
+    # 檢查 port 是否可連接
+    if nc -z localhost 5432 2>/dev/null; then
+        echo "✅ Port 5432 可連接"
+    else
+        echo "⚠️  Port 5432 無法連接"
+    fi
+    exit 0
+else
+    echo "❌ Port-forward 未運行"
+    echo ""
+    echo "啟動方式: ./db-port-forward.sh"
+    exit 1
+fi