chore: drop plan/ from git, ignore locally and purge on deploy

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy.sh

@@ -31,6 +31,12 @@ echo "[${DATE}] 执行 git fetch origin ${TARGET_BRANCH}..." >> "${LOG_FILE}"
 git fetch origin "${TARGET_BRANCH}" >> "${LOG_FILE}" 2>&1
 git reset --hard "origin/${TARGET_BRANCH}" >> "${LOG_FILE}" 2>&1
 
+# plan/ 仅本地文档，不入库；清理服务器上历史残留
+if [ -d "${DEPLOY_DIR}/plan" ]; then
+    rm -rf "${DEPLOY_DIR}/plan"
+    echo "[${DATE}] 已删除 plan/ 目录（不入库）" >> "${LOG_FILE}"
+fi
+
 # 恢复敏感配置文件（若被覆盖或缺失）
 if [ -f "application/database.php.deploy_bak" ]; then
     cp -p application/database.php.deploy_bak application/database.php