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-port-forward-stop.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+# 停止 CodiMD 資料庫 Port Forward
+
+echo "=== 停止 CodiMD 資料庫 Port Forward ==="
+
+# 方法 1: 使用保存的 PID
+if [ -f /tmp/codimd-db-port-forward.pid ]; then
+    PID=$(cat /tmp/codimd-db-port-forward.pid)
+    if ps -p $PID > /dev/null 2>&1; then
+        kill $PID
+        echo "✅ 已終止 PID: $PID"
+        rm -f /tmp/codimd-db-port-forward.pid
+        exit 0
+    else
+        echo "⚠️  PID $PID 不存在，嘗試其他方法..."
+        rm -f /tmp/codimd-db-port-forward.pid
+    fi
+fi
+
+# 方法 2: 使用 pgrep
+PIDS=$(pgrep -f "port-forward.*codimd-db")
+if [ -n "$PIDS" ]; then
+    echo "找到運行中的 port-forward process(es):"
+    echo "$PIDS"
+    pkill -f "port-forward.*codimd-db"
+    echo "✅ 已終止所有相關 process"
+    exit 0
+fi
+
+echo "❌ 沒有找到運行中的 port-forward"
+exit 1