Version: 0.9.76.dev.260505

后端：
1.阶段 6 agent / memory 服务化收口
- 新增 cmd/agent 独立进程入口，承载 agent zrpc server、agent outbox relay / consumer 和运行时依赖初始化
- 补齐 services/agent/rpc 的 Chat stream 与 conversation meta/list/timeline、schedule-preview、context-stats、schedule-state unary RPC
- 新增 gateway/client/agent 与 shared/contracts/agent，将 /api/v1/agent chat 和非 chat 门面切到 agent zrpc
- 收缩 gateway 本地 AgentService 装配，双 RPC 开关开启时不再初始化本地 agent 编排、LLM、RAG 和 memory reader fallback
- 将 backend/memory 物理迁入 services/memory，私有实现收入 internal，保留 module/model/observe 作为 memory 服务门面
- 调整 memory outbox、memory reader 和 agent 记忆渲染链路的 import 与服务边界，cmd/memory 独占 memory worker / consumer
- 关闭 gateway 侧 agent outbox worker 所有权，agent relay / consumer 由 cmd/agent 独占，gateway 仅保留 HTTP/SSE 门面与迁移期开关回退
- 更新阶段 6 文档，记录 agent / memory 当前切流点、smoke 结果，以及 backend/client 与 gateway/shared 的目录收口口径

backend/services/memory/internal/service/config_loader.go

@@ -0,0 +1,91 @@
+package service
+
+import (
+	"time"
+
+	memorymodel "github.com/LoveLosita/smartflow/backend/services/memory/model"
+	"github.com/spf13/viper"
+)
+
+// LoadConfigFromViper 读取记忆模块配置并做默认值兜底。
+//
+// 默认策略：
+// 1. temperature/top_p 使用低随机参数，提升可复现性；
+// 2. Day1 先提供参数位，不强制所有参数立即生效；
+// 3. 轮询与重试参数给出保守默认值，避免对主链路造成压力。
+func LoadConfigFromViper() memorymodel.Config {
+	cfg := memorymodel.Config{
+		Enabled:             viper.GetBool("memory.enabled"),
+		RAGEnabled:          viper.GetBool("memory.rag.enabled"),
+		ReadMode:            memorymodel.NormalizeReadMode(viper.GetString("memory.read.mode")),
+		InjectRenderMode:    memorymodel.NormalizeInjectRenderMode(viper.GetString("memory.inject.renderMode")),
+		ExtractPrompt:       viper.GetString("memory.prompt.extract"),
+		DecisionPrompt:      viper.GetString("memory.prompt.decision"),
+		Threshold:           viper.GetFloat64("memory.threshold"),
+		EnableReranker:      viper.GetBool("memory.enableReranker"),
+		LLMTemperature:      viper.GetFloat64("memory.llm.temperature"),
+		LLMTopP:             viper.GetFloat64("memory.llm.topP"),
+		JobMaxRetry:         viper.GetInt("memory.job.maxRetry"),
+		WorkerPollEvery:     viper.GetDuration("memory.worker.pollEvery"),
+		WorkerClaimBatch:    viper.GetInt("memory.worker.claimBatch"),
+		ReadConstraintLimit: viper.GetInt("memory.read.constraintLimit"),
+		ReadPreferenceLimit: viper.GetInt("memory.read.preferenceLimit"),
+		ReadFactLimit:       viper.GetInt("memory.read.factLimit"),
+
+		// 决策层配置：默认关闭，灰度开启后才会生效。
+		DecisionEnabled:           viper.GetBool("memory.decision.enabled"),
+		DecisionCandidateTopK:     viper.GetInt("memory.decision.candidateTopK"),
+		DecisionCandidateMinScore: viper.GetFloat64("memory.decision.candidateMinScore"),
+		DecisionFallbackMode:      viper.GetString("memory.decision.fallbackMode"),
+		WriteMode:                 viper.GetString("memory.write.mode"),
+		WriteMinConfidence:        viper.GetFloat64("memory.write.minConfidence"),
+		LLMThinking:               viper.GetBool("agent.thinking.memory"),
+	}
+
+	if cfg.Threshold <= 0 {
+		cfg.Threshold = 0.55
+	}
+	if cfg.LLMTemperature <= 0 {
+		cfg.LLMTemperature = 0.1
+	}
+	if cfg.LLMTopP <= 0 {
+		cfg.LLMTopP = 0.2
+	}
+	if cfg.JobMaxRetry <= 0 {
+		cfg.JobMaxRetry = 6
+	}
+	if cfg.WorkerPollEvery <= 0 {
+		cfg.WorkerPollEvery = 2 * time.Second
+	}
+	if cfg.WorkerClaimBatch <= 0 {
+		cfg.WorkerClaimBatch = 1
+	}
+	cfg.ReadConstraintLimit = cfg.EffectiveReadConstraintLimit()
+	cfg.ReadPreferenceLimit = cfg.EffectiveReadPreferenceLimit()
+	cfg.ReadFactLimit = cfg.EffectiveReadFactLimit()
+	cfg.ReadMode = cfg.EffectiveReadMode()
+	cfg.InjectRenderMode = cfg.EffectiveInjectRenderMode()
+
+	// 决策层配置默认值兜底。
+	// 说明：
+	// 1. TopK 和 MinScore 是 Milvus 召回参数，需要保守默认值避免召回过多噪声候选；
+	// 2. FallbackMode 默认退回旧路径新增，保证决策流程异常时不丢数据；
+	// 3. WriteMode 由 DecisionEnabled 隐式决定，这里不做强制联动。
+	if cfg.DecisionCandidateTopK <= 0 {
+		cfg.DecisionCandidateTopK = 5
+	}
+	if cfg.DecisionCandidateMinScore <= 0 {
+		cfg.DecisionCandidateMinScore = 0.6
+	}
+	if cfg.DecisionFallbackMode == "" {
+		cfg.DecisionFallbackMode = "legacy_add"
+	}
+	if cfg.WriteMode == "" {
+		cfg.WriteMode = "legacy"
+	}
+	if cfg.WriteMinConfidence <= 0 {
+		cfg.WriteMinConfidence = 0.5
+	}
+
+	return cfg
+}