feat(t208): close candidate decision feedback loop

backend-api/internal/transport/webui/templates/task-detail.gohtml

@@ -86,8 +86,12 @@
       {{end}}
       {{if .Mode}}<p class="section-note">模式：{{.Mode}} · 搜索词：{{.SearchQuery}}</p>{{end}}
       {{if .Provenance}}<h3>本地模型出处</h3><pre class="audit-json">{{.Provenance}}</pre>{{end}}
-      {{if .Candidates}}<h3>候选与评估</h3><pre class="audit-json">{{.Candidates}}</pre>{{end}}
-      {{if .Recommendation}}<h3>本地推荐</h3><pre class="audit-json">{{.Recommendation}}</pre>{{end}}
+      {{if .Observations}}<h3>原始候选观察</h3><pre class="audit-json">{{.Observations}}</pre>{{end}}
+      {{if .ModelPredictions}}<h3>模型逐项评估</h3><pre class="audit-json">{{.ModelPredictions}}</pre>{{end}}
+      {{if .DeterministicRecommendation}}<h3>确定性推荐</h3><pre class="audit-json">{{.DeterministicRecommendation}}</pre>{{end}}
+      {{if .HumanReviews}}<h3>人工选择与拒绝</h3><pre class="audit-json">{{.HumanReviews}}</pre>{{end}}
+      {{if and (not .Observations) .Candidates}}<h3>候选与评估（兼容记录）</h3><pre class="audit-json">{{.Candidates}}</pre>{{end}}
+      {{if and (not .DeterministicRecommendation) .Recommendation}}<h3>本地推荐（兼容记录）</h3><pre class="audit-json">{{.Recommendation}}</pre>{{end}}
       {{if .Evidence}}
       <h3>证据截图</h3>
       <div class="audit-evidence-grid">

backend-api/internal/transport/webui/types.go

@@ -62,14 +62,18 @@ type Task struct {
 }
 
 type ExecutionReport struct {
-	Events         []ExecutionReportEvent
-	Evidence       []ExecutionReportEvidence
-	Mode           string
-	SearchQuery    string
-	Provenance     string
-	Candidates     string
-	Recommendation string
-	Outcome        *ExecutionReportOutcome
+	Events                      []ExecutionReportEvent
+	Evidence                    []ExecutionReportEvidence
+	Mode                        string
+	SearchQuery                 string
+	Provenance                  string
+	Candidates                  string
+	Recommendation              string
+	Observations                string
+	ModelPredictions            string
+	DeterministicRecommendation string
+	HumanReviews                string
+	Outcome                     *ExecutionReportOutcome
 }
 
 type ExecutionReportEvent struct {

backend-api/internal/transport/webui/usecase_adapter.go

@@ -216,6 +216,17 @@ func executionReportFrom(report *domain.ExecutionReport) *ExecutionReport {
 		result.Candidates = prettyAuditJSON(&batch.CandidatesJSON)
 		result.Recommendation = prettyAuditJSON(batch.RecommendationJSON)
 	}
+	if dataset := report.DecisionDataset; dataset != nil {
+		result.Observations = prettyValueJSON(dataset.Observations)
+		result.ModelPredictions = prettyValueJSON(map[string]any{
+			"model_run":   dataset.ModelRun,
+			"evaluations": dataset.Evaluations,
+		})
+		result.DeterministicRecommendation = prettyValueJSON(
+			dataset.Recommendation,
+		)
+		result.HumanReviews = prettyValueJSON(dataset.HumanReviews)
+	}
 	if outcome := report.Outcome; outcome != nil {
 		result.Outcome = &ExecutionReportOutcome{
 			ResultType:                   outcome.ResultType,
@@ -247,6 +258,17 @@ func prettyAuditJSON(value *string) string {
 	return string(formatted)
 }
 
+func prettyValueJSON(value any) string {
+	if value == nil {
+		return ""
+	}
+	formatted, err := json.MarshalIndent(value, "", "  ")
+	if err != nil || string(formatted) == "null" || string(formatted) == "[]" {
+		return ""
+	}
+	return string(formatted)
+}
+
 func stringValue(value *string) string {
 	if value == nil {
 		return ""