feat: admin 端点补齐 + 视觉真推理 + 语音链路 + wire.go 收口（A+B+第3步）

批次A admin 端点（原本 404 变 200 真实数据）：
- GET /admin/llm：读 s.cfg.LLM 组 openai+anthropic 两 provider（enabled=当前 Provider、multimodal=配 VisionModel），APIKey 不进 wire 零泄露。
- GET /admin/automations：*automations.Service.List()（reminders+event rules+cron schedules，cron 加只读登记）。
- GET /admin/users：cfg.AdminUser + *auth.APIKey.List()（密钥掩码）；无用户存储，恒先返回当前 admin 账号。
- GET /admin/backthink：*backthink.Backthink.List(ctx,50)。均只读、owner/admin RBAC、{data} 信封。

批次B 视觉真推理 + 语音：
- rest.go chatRequest 加 Image?；流式 publishChatStream 带 image；userChatMessages 构造 ImageMessage(model.go:71)。
- loop/vision.go：ImageResolver 可注入（MVP 先看图再对话）；run.go Run 开头 resolveImages，无 resolver 透传直交主模型。
- vision/resolver.go：MessageResolver 调 vision.Router.Route——KindMain 保留图片交主模型多模态、KindVisionTool/OCRTool 经 dispatcher.Invoke 折叠成 [图片内容] 文本、KindUnsupported 记日志保留原图不崩。
- gateway/voice.go：VoiceService 接口 + SetVoice 注入点 + handleVoiceInput（未注入回 error 不崩）+ runVoiceTurn 异步 STT→loop chat→TTS→定向 voice_output 帧。
- ws_hub/ws_route：voice_input 接 handleVoiceInput；前端 ws.ts decodeBase64/playVoiceAudio/case voice_output。

第3步 wire.go 收口（唯一碰 wire.go 的一步）：
- Deps 补传 Automations:a.automation / Backthink:a.backthink / Users:auth.NewAPIKey(a.cfg.Auth)（*auth.APIKey 原生满足 UserStore，避免 admin 重复的复合类型）。
- gw.SetVoice(a.voice)；loop.Options.Vision = vision.NewMessageResolver(router, info, dispatcher.Invoke)（router=NewRouter(WithVisionTool/WithOCRTool)、info=cfg.LLM.VisionModel）。

实机验证：四 admin 端点 200 真实数据（llm 双 provider 脱敏、users=admin,yeij0942,owner）；WS 握手正常。go build/vet/test 全绿 + 前端 tsc。wire.go 557 行。

internal/services/gateway/rest.go

@@ -57,10 +57,13 @@ type loginResponse struct {
 }
 
 // chatRequest is the POST /api/v1/chat body. When Stream is true the gateway
-// triggers streaming over the WebSocket channel and returns immediately.
+// triggers streaming over the WebSocket channel and returns immediately. Image is
+// an optional base64 data: URI or http(s) URL attached for the vision path; the
+// loop routes it through the vision/OCR tool or the main model (design/06 §0).
 type chatRequest struct {
 	SessionID string `json:"sessionId"`
 	Text      string `json:"text"`
+	Image     string `json:"image,omitempty"`
 	Stream    bool   `json:"stream"`
 }
 
@@ -108,12 +111,12 @@ func (s *Server) handleChat(w http.ResponseWriter, r *http.Request) {
 		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "invalid request body"))
 		return
 	}
-	if strings.TrimSpace(req.Text) == "" {
-		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "text is required"))
+	if strings.TrimSpace(req.Text) == "" && strings.TrimSpace(req.Image) == "" {
+		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "text or image is required"))
 		return
 	}
 	if req.Stream {
-		s.publishChatStream(r.Context(), req.SessionID, req.Text)
+		s.publishChatStream(r.Context(), req.SessionID, req.Text, req.Image)
 		writeJSON(w, http.StatusOK, map[string]any{"stream": true})
 		return
 	}
@@ -124,7 +127,7 @@ func (s *Server) handleChat(w http.ResponseWriter, r *http.Request) {
 	if req.SessionID == "" {
 		req.SessionID = "web"
 	}
-	res, err := s.runner.Run(r.Context(), req.SessionID, []model.Message{model.TextMessage(model.RoleUser, req.Text)})
+	res, err := s.runner.Run(r.Context(), req.SessionID, userChatMessages(req.Text, req.Image))
 	if err != nil {
 		s.log.Error("chat run", "err", err, "session", req.SessionID)
 		writeError(w, apperr.Wrap(apperr.ErrInternal, "chat_failed", "chat failed"))
@@ -185,6 +188,16 @@ func firstMode(modes []string) string {
 	return modes[0]
 }
 
+// userChatMessages builds the user turn for a chat / stream request. When image is
+// present the turn becomes an image message (with optional text); otherwise a
+// plain text message. An empty text with an image yields an image-only turn.
+func userChatMessages(text, image string) []model.Message {
+	if strings.TrimSpace(image) != "" {
+		return []model.Message{model.ImageMessage(model.RoleUser, text, image)}
+	}
+	return []model.Message{model.TextMessage(model.RoleUser, text)}
+}
+
 // summaryOfSession maps a session.Session to its wire shape.
 func summaryOfSession(sess session.Session) SessionSummary {
 	return SessionSummary{