AI分析功能：LLM Key 改为数据库管理，支持管理员后台配置

web/backend/internal/handlers/llm_config.go

@@ -0,0 +1,86 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+	"strings"
+
+	"trade/web/internal/store"
+)
+
+type llmConfigReq struct {
+	BaseURL string `json:"base_url"`
+	APIKey  string `json:"api_key"`
+	Model   string `json:"model"`
+}
+
+type llmConfigResp struct {
+	BaseURL   string `json:"base_url"`
+	APIKey    string `json:"api_key"`    // 脱敏：仅显示首尾
+	Model     string `json:"model"`
+	HasAPIKey bool   `json:"has_api_key"` // 前端据此判断是否已配置
+}
+
+// maskKey 将 sk-abc123xyz 脱敏为 sk-a...xyz。
+func maskKey(key string) string {
+	if len(key) <= 8 {
+		return strings.Repeat("*", len(key))
+	}
+	return key[:4] + "..." + key[len(key)-4:]
+}
+
+// GetLLMConfig 返回当前 LLM 配置（API Key 脱敏）。
+func (d *Deps) GetLLMConfig(w http.ResponseWriter, r *http.Request) {
+	cfg, err := d.Futures.GetLLMConfig()
+	if err != nil {
+		writeErr(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	resp := llmConfigResp{
+		BaseURL:   cfg.BaseURL,
+		Model:     cfg.Model,
+		HasAPIKey: cfg.APIKey != "",
+	}
+	if cfg.APIKey != "" {
+		resp.APIKey = maskKey(cfg.APIKey)
+	}
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// SaveLLMConfig 保存 LLM 配置。api_key 为脱敏占位时保留原值。
+func (d *Deps) SaveLLMConfig(w http.ResponseWriter, r *http.Request) {
+	var req llmConfigReq
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeErr(w, http.StatusBadRequest, "invalid json")
+		return
+	}
+	req.BaseURL = strings.TrimSpace(req.BaseURL)
+	req.Model = strings.TrimSpace(req.Model)
+	if req.BaseURL == "" {
+		req.BaseURL = "https://api.deepseek.com/v1"
+	}
+	if req.Model == "" {
+		req.Model = "deepseek-chat"
+	}
+
+	// 如果前端传的是脱敏值（含 ...），说明未修改 Key，保留旧值
+	if strings.Contains(req.APIKey, "...") {
+		old, err := d.Futures.GetLLMConfig()
+		if err != nil {
+			writeErr(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+		req.APIKey = old.APIKey
+	}
+
+	cfg := &store.LLMConfig{
+		BaseURL: req.BaseURL,
+		APIKey:  req.APIKey,
+		Model:   req.Model,
+	}
+	if err := d.Futures.SaveLLMConfig(cfg); err != nil {
+		writeErr(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+}