feat(imports): add real pricing and subscription collectors

Add plan catalog and subscription schema support, seed baselines, and real importers for core domestic subscriptions plus stable official pricing sources.

This commit also hardens the shared fetch layers so the importers can support live collection and database writes instead of relying on manual placeholders alone.

scripts/import_ucloud_pricing.go

@@ -0,0 +1,88 @@
+//go:build llm_script
+
+package main
+
+import (
+	"database/sql"
+	"flag"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"time"
+)
+
+type ucloudPricingImportConfig struct {
+	URL     string
+	Fixture string
+	DryRun  bool
+	Timeout time.Duration
+}
+
+func main() {
+	loadSubscriptionImportEnv()
+
+	var url string
+	var fixture string
+	var dryRun bool
+	var timeoutSeconds int
+
+	flag.StringVar(&url, "url", defaultUCloudPricingURL, "UCloud UModelVerse 官方价格页")
+	flag.StringVar(&fixture, "fixture", "", "UCloud 价格样例文件")
+	flag.BoolVar(&dryRun, "dry-run", false, "仅解析并打印摘要，不写入数据库")
+	flag.IntVar(&timeoutSeconds, "timeout", 20, "请求超时（秒）")
+	flag.Parse()
+
+	cfg := ucloudPricingImportConfig{
+		URL:     url,
+		Fixture: fixture,
+		DryRun:  dryRun,
+		Timeout: time.Duration(timeoutSeconds) * time.Second,
+	}
+
+	var db *sql.DB
+	var err error
+	if !cfg.DryRun {
+		db, err = subscriptionImportDB()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "open db: %v\n", err)
+			os.Exit(1)
+		}
+		defer db.Close()
+	}
+
+	if err := runUCloudPricingImport(cfg, db, os.Stdout); err != nil {
+		fmt.Fprintf(os.Stderr, "import_ucloud_pricing: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func runUCloudPricingImport(cfg ucloudPricingImportConfig, db *sql.DB, out io.Writer) error {
+	client := &http.Client{Timeout: cfg.Timeout}
+	raw, err := fetchSubscriptionPage(cfg.URL, cfg.Fixture, client)
+	if err != nil {
+		return err
+	}
+	records, err := parseUCloudPricingCatalog(raw)
+	if err != nil {
+		return err
+	}
+	records = dedupeOfficialPricingRecords(records)
+	if cfg.DryRun {
+		_, err = fmt.Fprintf(out, "source=ucloud-pricing-import models=%d operator=%s dry_run=true\n", len(records), records[0].OperatorName)
+		return err
+	}
+	if db == nil {
+		return fmt.Errorf("db is required when dry-run=false")
+	}
+	if err := upsertOfficialPricingRecords(db, records, "ucloud-pricing-import"); err != nil {
+		return err
+	}
+
+	var tableRows int
+	if err := db.QueryRow(`SELECT COUNT(*) FROM region_pricing`).Scan(&tableRows); err != nil {
+		return fmt.Errorf("count region_pricing: %w", err)
+	}
+	_, err = fmt.Fprintf(out, "source=ucloud-pricing-import models=%d operator=%s table_rows=%d dry_run=false\n", len(records), records[0].OperatorName, tableRows)
+	return err
+}