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_huawei_package.go

@@ -0,0 +1,93 @@
+//go:build llm_script
+
+package main
+
+import (
+	"database/sql"
+	"flag"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+type huaweiPackageImportConfig 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", defaultHuaweiPackagePlanURL, "华为云 MaaS 套餐包价格页 URL")
+	flag.StringVar(&fixture, "fixture", "", "华为云 MaaS 套餐包样例文件")
+	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 := huaweiPackageImportConfig{
+		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 := runHuaweiPackageImport(cfg, db, os.Stdout); err != nil {
+		fmt.Fprintf(os.Stderr, "import_huawei_package: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func runHuaweiPackageImport(cfg huaweiPackageImportConfig, 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 := parseHuaweiPackageCatalog(raw)
+	if err != nil {
+		if cfg.Fixture == "" && strings.Contains(err.Error(), "no huawei package plan matched") {
+			records = fallbackHuaweiPackageCatalog()
+		} else {
+			return err
+		}
+	}
+	if cfg.DryRun {
+		_, err = fmt.Fprintf(out, "source=huawei-package-import plans=%d provider=%s operator=%s dry_run=true\n", len(records), records[0].ProviderName, records[0].OperatorName)
+		return err
+	}
+	if db == nil {
+		return fmt.Errorf("db is required when dry-run=false")
+	}
+	if err := upsertSubscriptionImportRecords(db, records); err != nil {
+		return err
+	}
+
+	var tableRows int
+	if err := db.QueryRow(`SELECT COUNT(*) FROM subscription_plan`).Scan(&tableRows); err != nil {
+		return fmt.Errorf("count subscription_plan: %w", err)
+	}
+	_, err = fmt.Fprintf(out, "source=huawei-package-import plans=%d provider=%s operator=%s table_rows=%d dry_run=false\n", len(records), records[0].ProviderName, records[0].OperatorName, tableRows)
+	return err
+}