feat(import): persist official model release metadata

scripts/import_phase2_data.go

@@ -9,6 +9,7 @@ import (
 	"log"
 	"os"
 	"strings"
+	"time"
 
 	_ "github.com/lib/pq"
 )
@@ -48,10 +49,22 @@ type ModelPricing struct {
 	ContextLength   int
 	IsFree          bool
 	SourceURL       string
+	ReleaseDate     string
 	Modality        string
 	SceneTags       []string
 }
 
+func releaseDateValue(raw string) time.Time {
+	if strings.TrimSpace(raw) == "" {
+		return time.Now()
+	}
+	parsed, err := time.Parse("2006-01-02", raw)
+	if err != nil {
+		return time.Now()
+	}
+	return parsed
+}
+
 func parseZhipuPrice(s string) float64 {
 	// Extract price from strings like "6元", "免费", "限时免费"
 	if strings.Contains(s, "免费") {
@@ -188,16 +201,24 @@ func main() {
 		var modelID int64
 		err = db.QueryRow("SELECT id FROM models WHERE external_id = $1", p.ModelID).Scan(&modelID)
 		if err == sql.ErrNoRows {
-			err = db.QueryRow(
-				`INSERT INTO models (external_id, name, provider_id, modality, context_length, status, source, batch_id) 
-				 VALUES ($1, $2, $3, $4, $5, 'active', $6, $7) RETURNING id`,
-				p.ModelID, p.ModelName, providerID, p.Modality, p.ContextLength, p.OperatorName, batchID,
-			).Scan(&modelID)
+		err = db.QueryRow(
+			`INSERT INTO models (external_id, name, provider_id, modality, context_length, status, source, batch_id, source_url, release_date) 
+			 VALUES ($1, $2, $3, $4, $5, 'active', $6, $7, $8, $9) RETURNING id`,
+			p.ModelID, p.ModelName, providerID, p.Modality, p.ContextLength, p.OperatorName, batchID, p.SourceURL, releaseDateValue(p.ReleaseDate),
+		).Scan(&modelID)
 		}
 		if err != nil {
 			log.Printf("Model error: %v", err)
 			continue
 		}
+		_, _ = db.Exec(
+			`UPDATE models
+			 SET source_url = COALESCE(NULLIF(source_url, ''), $2),
+			     release_date = COALESCE(release_date, $3),
+			     updated_at = CURRENT_TIMESTAMP
+			 WHERE id = $1`,
+			modelID, p.SourceURL, releaseDateValue(p.ReleaseDate),
+		)
 
 		// Insert pricing
 		sourceType := p.OperatorType