Version: 0.4.4.dev.260307

feat: 🚀 增强会话管理与缓存机制

* 会话 ID 空值兜底，若 `conversation_id` 为空时自动生成 UUID
* 在响应头写入 `X-Conversation-ID`，供前端使用，保持同一会话状态

perf: ⚡ 会话状态缓存优化

* 当缓存未命中但 DB 已确认/创建会话后，调用 `SetConversationStatus` 回写 Redis
* 缓存写回失败时记录日志，不中断聊天主流程，确保业务流畅性

fix: 🐛 修复历史消息顺序问题与编译错误

* 修复历史消息顺序问题，保证返回的 N 条历史消息按时间正序喂给模型

  * 通过反转 `created_at desc` 查询结果的切片，确保模型输入顺序正确
* 修复 `fmt.Errorf` 参数不匹配问题，修正编译错误
* 整理 `agent-cache.go` 为标准 UTF-8 编码，避免 Go 编译报错 `invalid UTF-8 encoding`

feat: 🛠️ 独立构建 MCP 服务器

* 使用 `Codex` 构建独立于后端的 MCP 服务器，简化与 Codex 的协作
* 通过该服务器方便 Codex 直接测试和查看 Redis 与 MySQL 中的数据

infra/smartflow-mcp-server/internal/tools/redis_tools.go

@@ -0,0 +1,130 @@
+package tools
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/LoveLosita/smartflow/infra/smartflow-mcp-server/internal/store"
+)
+
+type RedisGetTool struct {
+	client         *store.RedisClient
+	valueMaxItems  int
+	maxStringBytes int
+}
+
+func NewRedisGetTool(client *store.RedisClient, valueMaxItems int, maxStringBytes int) *RedisGetTool {
+	return &RedisGetTool{client: client, valueMaxItems: valueMaxItems, maxStringBytes: maxStringBytes}
+}
+
+func (t *RedisGetTool) Name() string {
+	return "redis_get"
+}
+
+func (t *RedisGetTool) Description() string {
+	return "Get a Redis key by name and return its type and value."
+}
+
+func (t *RedisGetTool) InputSchema() map[string]any {
+	return map[string]any{
+		"type": "object",
+		"properties": map[string]any{
+			"key": map[string]any{
+				"type":        "string",
+				"description": "Redis key",
+			},
+		},
+		"required":             []string{"key"},
+		"additionalProperties": false,
+	}
+}
+
+func (t *RedisGetTool) Execute(ctx context.Context, args map[string]any) (map[string]any, error) {
+	key, ok := args["key"].(string)
+	if !ok || key == "" {
+		return nil, fmt.Errorf("key must be a non-empty string")
+	}
+	res, err := t.client.GetWithType(ctx, key, t.valueMaxItems, t.maxStringBytes)
+	if err != nil {
+		return nil, err
+	}
+	return map[string]any{
+		"exists":     res.Exists,
+		"key":        res.Key,
+		"type":       res.Type,
+		"value":      res.Value,
+		"truncated":  res.Truncated,
+		"durationMs": res.DurationMs,
+	}, nil
+}
+
+type RedisScanTool struct {
+	client       *store.RedisClient
+	maxKeys      int
+	maxScanCount int
+}
+
+func NewRedisScanTool(client *store.RedisClient, maxKeys int, maxScanCount int) *RedisScanTool {
+	return &RedisScanTool{client: client, maxKeys: maxKeys, maxScanCount: maxScanCount}
+}
+
+func (t *RedisScanTool) Name() string {
+	return "redis_scan"
+}
+
+func (t *RedisScanTool) Description() string {
+	return "Scan Redis keys by pattern with capped result size."
+}
+
+func (t *RedisScanTool) InputSchema() map[string]any {
+	return map[string]any{
+		"type": "object",
+		"properties": map[string]any{
+			"pattern": map[string]any{
+				"type":        "string",
+				"description": "Pattern, for example user:*",
+			},
+			"count": map[string]any{
+				"type":        "number",
+				"description": "Optional scan count hint",
+			},
+		},
+		"required":             []string{"pattern"},
+		"additionalProperties": false,
+	}
+}
+
+func (t *RedisScanTool) Execute(ctx context.Context, args map[string]any) (map[string]any, error) {
+	pattern, ok := args["pattern"].(string)
+	if !ok || pattern == "" {
+		return nil, fmt.Errorf("pattern must be a non-empty string")
+	}
+
+	count := int64(20)
+	if rawCount, ok := args["count"]; ok {
+		number, ok := rawCount.(float64)
+		if !ok {
+			return nil, fmt.Errorf("count must be a number")
+		}
+		if number <= 0 {
+			return nil, fmt.Errorf("count must be > 0")
+		}
+		count = int64(number)
+	}
+	if count > int64(t.maxScanCount) {
+		count = int64(t.maxScanCount)
+	}
+
+	res, err := t.client.ScanKeys(ctx, pattern, count, t.maxKeys)
+	if err != nil {
+		return nil, err
+	}
+	return map[string]any{
+		"pattern":    res.Pattern,
+		"keys":       res.Keys,
+		"returned":   res.Returned,
+		"nextCursor": res.NextCursor,
+		"truncated":  res.Truncated,
+		"durationMs": res.DurationMs,
+	}, nil
+}