main:删除指标脚本并优化指标记录逻辑

变更内容：
- 删除 `start_metrics.sh` 脚本，精简项目结构，移除不再需要的启动逻辑。
- 优化 HTTP 请求指标记录，新增健康检查端点过滤和路径参数规范化功能。
- 更新文档，添加指标过滤及路径规范化的详细说明。
- 提高 Prometheus 指标的性能和可维护性，避免标签基数爆炸。

scripts/start_metrics.sh

@@ -1,114 +0,0 @@
-#!/bin/bash
-# 指标方案快速启动脚本
-
-set -e
-
-# 颜色定义
-RED='\033[0;31m'
-GREEN='\033[0;32m'
-YELLOW='\033[1;33m'
-NC='\033[0m' # No Color
-
-echo "=========================================="
-echo "FunctionalScaffold 指标方案启动脚本"
-echo "=========================================="
-
-# 检查 docker-compose
-if ! command -v docker-compose &> /dev/null; then
-    echo -e "${RED}错误: docker-compose 未安装${NC}"
-    exit 1
-fi
-
-# 选择方案
-echo ""
-echo "请选择指标方案："
-echo "1. Pushgateway（推荐，适合 Serverless）"
-echo "2. Redis + Exporter（适合高并发）"
-echo "3. 两者都启动（用于对比测试）"
-echo ""
-read -p "输入选项 (1/2/3): " choice
-
-cd "$(dirname "$0")/../deployment"
-
-case $choice in
-    1)
-        echo -e "${GREEN}启动 Pushgateway 方案...${NC}"
-        docker-compose up -d redis pushgateway prometheus grafana
-        echo ""
-        echo -e "${GREEN}✓ Pushgateway 方案已启动${NC}"
-        echo ""
-        echo "服务地址："
-        echo "  - Pushgateway: http://localhost:9091"
-        echo "  - Prometheus:  http://localhost:9090"
-        echo "  - Grafana:     http://localhost:3000 (admin/admin)"
-        echo ""
-        echo "下一步："
-        echo "  1. 修改代码导入: from functional_scaffold.core.metrics_pushgateway import ..."
-        echo "  2. 配置环境变量: PUSHGATEWAY_URL=localhost:9091"
-        echo "  3. 启动应用: ./scripts/run_dev.sh"
-        echo "  4. 运行测试: python scripts/test_metrics.py pushgateway"
-        ;;
-    2)
-        echo -e "${GREEN}启动 Redis 方案...${NC}"
-
-        # 检查 redis 依赖
-        if ! python -c "import redis" 2>/dev/null; then
-            echo -e "${YELLOW}警告: redis 库未安装${NC}"
-            echo "正在安装 redis..."
-            pip install redis
-        fi
-
-        docker-compose up -d redis redis-exporter prometheus grafana
-        echo ""
-        echo -e "${GREEN}✓ Redis 方案已启动${NC}"
-        echo ""
-        echo "服务地址："
-        echo "  - Redis:        localhost:6379"
-        echo "  - Redis Exporter: http://localhost:8001/metrics"
-        echo "  - Prometheus:   http://localhost:9090"
-        echo "  - Grafana:      http://localhost:3000 (admin/admin)"
-        echo ""
-        echo "下一步："
-        echo "  1. 修改代码导入: from functional_scaffold.core.metrics_redis import ..."
-        echo "  2. 配置环境变量: REDIS_HOST=localhost REDIS_PORT=6379"
-        echo "  3. 启动应用: ./scripts/run_dev.sh"
-        echo "  4. 运行测试: python scripts/test_metrics.py redis"
-        ;;
-    3)
-        echo -e "${GREEN}启动所有服务...${NC}"
-
-        # 检查 redis 依赖
-        if ! python -c "import redis" 2>/dev/null; then
-            echo -e "${YELLOW}警告: redis 库未安装${NC}"
-            echo "正在安装 redis..."
-            pip install redis
-        fi
-
-        docker-compose up -d
-        echo ""
-        echo -e "${GREEN}✓ 所有服务已启动${NC}"
-        echo ""
-        echo "服务地址："
-        echo "  - 应用:         http://localhost:8000"
-        echo "  - Pushgateway:  http://localhost:9091"
-        echo "  - Redis:        localhost:6379"
-        echo "  - Redis Exporter: http://localhost:8001/metrics"
-        echo "  - Prometheus:   http://localhost:9090"
-        echo "  - Grafana:      http://localhost:3000 (admin/admin)"
-        echo ""
-        echo "下一步："
-        echo "  1. 查看文档: cat docs/metrics-guide.md"
-        echo "  2. 运行测试: python scripts/test_metrics.py"
-        ;;
-    *)
-        echo -e "${RED}无效的选项${NC}"
-        exit 1
-        ;;
-esac
-
-echo ""
-echo "=========================================="
-echo "查看日志: docker-compose logs -f"
-echo "停止服务: docker-compose down"
-echo "查看文档: cat ../docs/metrics-guide.md"
-echo "=========================================="