fix: cap distiller startup scan and switch to formal SDK module dependency

- replace vendored third_party/homeagent-sdk with formal module dependency
- keep canonical SDK via go.mod pinned commit
- optimize distiller startup loading to stream recent raw records only
- parse timestamps correctly and cap startup load to 5000 records
- remove quadratic string building in raw record parsing
- restore fast startup while preserving memory pipeline

third_party/homeagent-sdk/hack/plugin-dev/scaffold.sh

@@ -1,45 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-# HomeAgent 插件脚手架生成工具
-# 用法: ./scaffold.sh <plugin-name> [输出目录]
-# 示例: ./scaffold.sh myplugin ./plugins/myplugin
-
-NAME="${1:-}"
-OUTDIR="${2:-./plugins/$NAME}"
-
-if [ -z "$NAME" ]; then
-	echo "用法: $0 <plugin-name> [输出目录]"
-	echo "示例: $0 myplugin ./plugins/myplugin"
-	exit 1
-fi
-
-if [ -d "$OUTDIR" ]; then
-	echo "错误: 目标目录已存在: $OUTDIR"
-	exit 1
-fi
-
-SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-TEMPLATE_DIR="$SCRIPT_DIR/templates"
-
-mkdir -p "$OUTDIR"
-
-# 替换模板中的占位符
-sed -e "s/{{.Name}}/$NAME/g" \
-	-e "s/{{.Version}}/0.1.0/g" \
-	-e "s/{{.Description}}//g" \
-	-e "s/{{.Author}}//g" \
-	"$TEMPLATE_DIR/plugin.json.tmpl" > "$OUTDIR/plugin.json"
-
-cp "$TEMPLATE_DIR/plugin.go.tmpl" "$OUTDIR/plugin.go"
-cp "$TEMPLATE_DIR/Makefile.tmpl" "$OUTDIR/Makefile"
-cp "$TEMPLATE_DIR/gitignore.tmpl" "$OUTDIR/.gitignore"
-
-echo "✅ 插件脚手架已生成: $OUTDIR"
-echo ""
-echo "下一步:"
-echo "  1. 编辑 $OUTDIR/plugin.go 实现业务逻辑"
-echo "  2. 编辑 $OUTDIR/plugin.json 完善元信息"
-echo "  3. cd $OUTDIR && make          # 编译 plugin.so"
-echo "  4. make package                # 打包为 .hmap 分发包"
-echo "  5. 通过 WebUI 或 plugin_install 工具安装"