feat: embedding 配置搬上控制面 — 数据源页可视化配置 + 热更新

embedding 从 env 改为控制面驱动(持久化+可视化)，复用 chat 模型同套范式：
配置控制面泛化为按 kind(chat/embedding)，加 embedding kind。

- shared: 配置 subjects 泛化 sundynix.config.<kind>.get/.updated；bus 方法改 kind 参数
  (RequestConfig/ServeConfig/PublishConfigUpdated/SubscribeConfigUpdated)
- gateway: sundynix_model 加 kind 列(每 kind 唯一激活)+旧行回填 chat；admin 按 kind
  增删改/激活/列表，测试连接 embedding 走 POST /embeddings；main 按 kind ServeConfig；
  变更广播各 kind
- dispatcher: 取 chat 配置(kind 化)
- mcp-go: rag.Engine.SetEmbedding 热更新(RWMutex)；main 取/订阅 embedding 控制面配置
  (覆盖 env)
- admin 控制台: api 按 kind；抽出复用 ModelManager；ModelsPage(chat)+新 DatasourcesPage
  (embedding + 向量/图库占位)；routes 数据源页就绪
- 验证: 全模块 build✓ + e2e PASS + 控制台 npm build✓；live 全跑通——chat(DeepSeek 回填
  kind 仍工作)；mcp-go 不带 EMBED env 启动→控制台配 embedding(百炼)→测试连接✓→激活
  →NATS 热更新 mcp-go→入库+语义检索'存向量的数据库'→Milvus；浏览器数据源页拉到激活配置

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-gateway/internal/handler/admin.go

@@ -1,7 +1,9 @@
 package handler
 
 import (
+	"bytes"
 	"context"
+	"encoding/json"
 	"net/http"
 	"strconv"
 	"time"
@@ -17,15 +19,16 @@ import (
 
 type modelBody struct {
 	ID       uint   `json:"id"`
+	Kind     string `json:"kind"`
 	Provider string `json:"provider"`
 	BaseURL  string `json:"base_url"`
 	APIKey   string `json:"api_key"`
 	Model    string `json:"model"`
 }
 
-// ListModels: GET /api/v1/admin/models —— 列出模型（api_key 脱敏）。
+// ListModels: GET /api/v1/admin/models?kind=chat|embedding —— 列出模型（api_key 脱敏）。
 func (h *Handler) ListModels(c *gin.Context) {
-	rows, err := h.db.ListModels(c.Request.Context())
+	rows, err := h.db.ListModels(c.Request.Context(), c.Query("kind"))
 	if err != nil {
 		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
 		return
@@ -33,7 +36,7 @@ func (h *Handler) ListModels(c *gin.Context) {
 	out := make([]gin.H, 0, len(rows))
 	for _, m := range rows {
 		out = append(out, gin.H{
-			"id": m.ID, "provider": m.Provider, "base_url": m.BaseURL,
+			"id": m.ID, "kind": m.Kind, "provider": m.Provider, "base_url": m.BaseURL,
 			"model": m.Model, "active": m.Active, "api_key": mask(m.APIKey),
 		})
 	}
@@ -51,12 +54,16 @@ func (h *Handler) SaveModel(c *gin.Context) {
 	if provider == "" {
 		provider = "openai-compatible"
 	}
-	m := &store.LLMModel{ID: b.ID, Provider: provider, BaseURL: b.BaseURL, APIKey: b.APIKey, Model: b.Model}
+	kind := b.Kind
+	if kind == "" {
+		kind = contract.ConfigKindChat
+	}
+	m := &store.LLMModel{ID: b.ID, Kind: kind, Provider: provider, BaseURL: b.BaseURL, APIKey: b.APIKey, Model: b.Model}
 	if err := h.db.SaveModel(c.Request.Context(), m); err != nil {
 		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
 		return
 	}
-	h.broadcastActiveModel(c.Request.Context())
+	h.broadcastActive(c.Request.Context())
 	c.JSON(http.StatusOK, gin.H{"id": m.ID})
 }
 
@@ -67,7 +74,7 @@ func (h *Handler) SetActiveModel(c *gin.Context) {
 		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
 		return
 	}
-	h.broadcastActiveModel(c.Request.Context())
+	h.broadcastActive(c.Request.Context())
 	c.JSON(http.StatusOK, gin.H{"status": "ok", "active": id})
 }
 
@@ -78,7 +85,7 @@ func (h *Handler) DeleteModel(c *gin.Context) {
 		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
 		return
 	}
-	h.broadcastActiveModel(c.Request.Context())
+	h.broadcastActive(c.Request.Context())
 	c.JSON(http.StatusOK, gin.H{"status": "ok"})
 }
 
@@ -92,7 +99,7 @@ func (h *Handler) TestModel(c *gin.Context) {
 	// 若传了已存的 id 但未带 key，用库里的真实 key。
 	key := b.APIKey
 	if key == "" && b.ID != 0 {
-		if rows, _ := h.db.ListModels(c.Request.Context()); rows != nil {
+		if rows, _ := h.db.ListModels(c.Request.Context(), ""); rows != nil {
 			for _, m := range rows {
 				if m.ID == b.ID {
 					key = m.APIKey
@@ -100,9 +107,17 @@ func (h *Handler) TestModel(c *gin.Context) {
 			}
 		}
 	}
-	ctx, cancel := context.WithTimeout(c.Request.Context(), 8*time.Second)
+	ctx, cancel := context.WithTimeout(c.Request.Context(), 10*time.Second)
 	defer cancel()
-	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, b.BaseURL+"/models", nil)
+	var req *http.Request
+	if b.Kind == contract.ConfigKindEmbedding {
+		// embedding 端点多无 /models，发一个最小 /embeddings 探测。
+		payload, _ := json.Marshal(map[string]any{"model": b.Model, "input": []string{"ping"}})
+		req, _ = http.NewRequestWithContext(ctx, http.MethodPost, b.BaseURL+"/embeddings", bytes.NewReader(payload))
+		req.Header.Set("Content-Type", "application/json")
+	} else {
+		req, _ = http.NewRequestWithContext(ctx, http.MethodGet, b.BaseURL+"/models", nil)
+	}
 	if key != "" {
 		req.Header.Set("Authorization", "Bearer "+key)
 	}
@@ -115,15 +130,17 @@ func (h *Handler) TestModel(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"ok": resp.StatusCode < 400, "message": "HTTP " + resp.Status})
 }
 
-// broadcastActiveModel 读当前激活配置并经 NATS 广播，触发 Dispatcher 热更新。
-func (h *Handler) broadcastActiveModel(ctx context.Context) {
-	row, _ := h.db.GetActiveModel(ctx)
-	if row == nil {
-		return
+// broadcastActive 重新广播各 kind 当前激活配置，触发对应消费方热更新。
+func (h *Handler) broadcastActive(ctx context.Context) {
+	for _, kind := range []string{contract.ConfigKindChat, contract.ConfigKindEmbedding} {
+		row, _ := h.db.GetActiveModel(ctx, kind)
+		if row == nil {
+			continue
+		}
+		_ = h.bus.PublishConfigUpdated(kind, &contract.ModelConfig{
+			Provider: row.Provider, BaseURL: row.BaseURL, APIKey: row.APIKey, Model: row.Model,
+		})
 	}
-	_ = h.bus.PublishModelConfigUpdated(&contract.ModelConfig{
-		Provider: row.Provider, BaseURL: row.BaseURL, APIKey: row.APIKey, Model: row.Model,
-	})
 }
 
 func mask(s string) string {