feat: 角色视觉体系（头像按角色取）+ 时间注入（loop 每轮当前时间）

【角色视觉体系（红线：每个角色自己的头像/背景，绝不串用昔涟）】
- persona.go：Persona 加 Visual{avatar, chatBackground{landscape,portrait}} + DefaultAvatar；每个角色各自配。
- cyrene.yaml：昔涟配 avatar(3F-Q-Happy-1) + chatBackground(横/竖屏)。
- PersonaStore 加 Persona(id)；PersonaSummary 加 avatar/chatBackground；collectPersonas 按角色取
  Persona(id) 视觉（无视觉→空，前端回退默认占位，绝不串角色）。
- 前端：types PersonaRecord 加 avatar/chatBackground；persona.ts personaAvatar(p)=p?.avatar||默认占位
  (殊无昔涟 fallback)；store 加 currentPersona；App 挂载 fetchPersonas 取默认角色；
  TopBar/chat 头像改 personaAvatar(currentPersona)（写死昔涟头像已清除）。

【时间注入（她自然知道现在几点，深夜催睡交给人格/capacity）】
- options.go Options 加 Timezone；loop.go Loop 加 timeLocation/timeZoneName + New 解析 + loadTimezone；
  time.go currentTimeBlock()(当前时间+周几+时区，每轮刷新)；memory.go assembleContext 在「工作记忆」
  前注入时间 system(keyed 在 timeLocation!=nil，无时区不注入不破坏测试)；wire.go Timezone=a.cfg.Timezone。

go build/vet/test 全绿(gateway/loop/persona)；前端 tsc/vite build 75模块绿。红线无写死昔涟头像。

internal/services/gateway/extra_test.go

@@ -21,6 +21,7 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/session"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/iot"
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/persona/loader"
 	personareg "git.yeij.top/AskaEth/Cyrene_v2/internal/persona/registry"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/knowledge"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/loop"
@@ -180,6 +181,10 @@ type stubPersonas struct {
 
 func (s *stubPersonas) List() []personareg.Character { return s.list }
 
+// Persona satisfies PersonaStore; tests don't rely on visual assets, so it
+// always reports no persona found (empty visuals, safe fallback).
+func (s *stubPersonas) Persona(string) (*loader.Persona, bool) { return nil, false }
+
 // stubMemories mimics MemoryStore, returning domain memory items that the gateway
 // maps to MemorySummary.
 type stubMemories struct {

internal/services/gateway/rest.go

@@ -24,6 +24,15 @@ type PersonaSummary struct {
 	IsDefault bool   `json:"isDefault"`
 	Mode      string `json:"mode"`
 	MemoryNS  string `json:"memoryNamespace"`
+	Avatar    string `json:"avatar,omitempty"`
+	// ChatBackground holds per-orientation wallpaper; a role's own, never another's.
+	ChatBackground ChatBackgroundSummary `json:"chatBackground,omitempty"`
+}
+
+// ChatBackgroundSummary mirrors the persona chatBackground on the wire.
+type ChatBackgroundSummary struct {
+	Landscape string `json:"landscape,omitempty"`
+	Portrait  string `json:"portrait,omitempty"`
 }
 
 // MemorySummary is the wire shape of a memory entry in the admin list response.
@@ -199,13 +208,28 @@ func (s *Server) collectPersonas() []PersonaSummary {
 		if id == "" {
 			id = c.ID
 		}
-		out = append(out, PersonaSummary{
+		sum := PersonaSummary{
 			ID:        id,
 			Name:      c.Name,
 			Character: c.Name,
 			IsDefault: c.Default,
 			Mode:      firstMode(c.Modes),
-		})
+		}
+		// Read this persona's own visual assets (avatar / chat background). Each
+		// role carries its own; a missing persona or unset visual yields empty,
+		// never another role's — the frontend falls back to a neutral default.
+		if p, ok := s.personas.Persona(id); ok && p != nil {
+			if p.Visual.Avatar != "" {
+				sum.Avatar = p.Visual.Avatar
+			}
+			if p.Visual.ChatBackground.Landscape != "" || p.Visual.ChatBackground.Portrait != "" {
+				sum.ChatBackground = ChatBackgroundSummary{
+					Landscape: p.Visual.ChatBackground.Landscape,
+					Portrait:  p.Visual.ChatBackground.Portrait,
+				}
+			}
+		}
+		out = append(out, sum)
 	}
 	return out
 }

internal/services/gateway/server.go

@@ -35,6 +35,7 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/iot"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/persona/loader"
 	personareg "git.yeij.top/AskaEth/Cyrene_v2/internal/persona/registry"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/knowledge"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/loop"
@@ -89,6 +90,10 @@ type SessionStore interface {
 // domain type so the wire shape stays out of the store contract.
 type PersonaStore interface {
 	List() []personareg.Character
+	// Persona returns the persona with the given id (to read its visual assets).
+	// The production registry implements it; the wire summary reads Avatar /
+	// ChatBackground from it so each role's visuals stay role-scoped.
+	Persona(id string) (*loader.Persona, bool)
 }
 
 // MemoryStore lists memory entries. *runtime/memory.Store is the production