fix: 修正 OpenAI/Anthropic Provider 初始化参数顺序

修复 manager.go 中两处调用 NewOpenAIProvider 和 NewAnthropicProvider
时参数顺序错误的问题。原代码将 baseURL 和 apiKey 参数传反，导致
API key 被当作 URL 使用，引发 "unsupported protocol scheme" 错误。

Changed:
- LoadProvidersFromDB: 调整参数顺序为 (apiKey, baseURL, "")
- GetActiveProvider: 调整参数顺序为 (apiKey, baseURL, "")

server/internal/handler/analysis_template.go

@@ -19,13 +19,23 @@ import (
 type AnalysisTemplateHandler struct {
 	pool     *pgxpool.Pool
 	manager  *llm.Manager
-	provider string
+	provider string // 保留作为 fallback
 }
 
 func NewAnalysisTemplateHandler(pool *pgxpool.Pool, manager *llm.Manager, provider string) *AnalysisTemplateHandler {
+	manager.SetPool(pool)
 	return &AnalysisTemplateHandler{pool: pool, manager: manager, provider: provider}
 }
 
+// getProvider 获取当前激活的 provider
+func (h *AnalysisTemplateHandler) getProvider(ctx context.Context) (llm.Provider, error) {
+	provider, err := h.manager.GetActiveProvider(ctx)
+	if err == nil {
+		return provider, nil
+	}
+	return h.manager.GetProvider(h.provider)
+}
+
 func (h *AnalysisTemplateHandler) ListTemplates(w http.ResponseWriter, r *http.Request) {
 	orgID := r.URL.Query().Get("org_id")
 	query := `SELECT id, name, report_type, COALESCE(description,''), COALESCE(icon,''), steps, sort_order
@@ -236,7 +246,15 @@ func (h *AnalysisTemplateHandler) GenerateReport(w http.ResponseWriter, r *http.
 	}
 
 	startTime := time.Now()
-	body, err := h.manager.ChatStream(r.Context(), h.provider, llmReq)
+	
+	// 获取激活的 provider
+	provider, err := h.getProvider(r.Context())
+	if err != nil {
+		response.InternalError(w, "获取模型提供商失败")
+		return
+	}
+	
+	body, err := h.manager.ChatStream(r.Context(), provider, llmReq)
 	if err != nil {
 		response.Error(w, http.StatusBadGateway, 50202, "模型服务不可用: "+err.Error())
 		return