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_zhipu_coding_plan_test.go

@@ -0,0 +1,66 @@
+//go:build llm_script
+
+package main
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestParseZhipuCodingPlanBuildsPromoEntry(t *testing.T) {
+	overviewRaw, err := os.ReadFile(filepath.Join("testdata", "zhipu_coding_plan_overview_sample.txt"))
+	if err != nil {
+		t.Fatalf("读取 overview fixture 失败: %v", err)
+	}
+	promoRaw, err := os.ReadFile(filepath.Join("testdata", "zhipu_coding_plan_promotion_sample.txt"))
+	if err != nil {
+		t.Fatalf("读取 promotion fixture 失败: %v", err)
+	}
+
+	plans, err := parseZhipuCodingPlanCatalog(string(overviewRaw), string(promoRaw))
+	if err != nil {
+		t.Fatalf("parseZhipuCodingPlanCatalog 返回错误: %v", err)
+	}
+	if len(plans) != 1 {
+		t.Fatalf("期望 1 条智谱公开活动价记录，实际 %d", len(plans))
+	}
+	if plans[0].PlanCode != "zhipu-coding-plan-promo-floor" {
+		t.Fatalf("planCode 错误: %q", plans[0].PlanCode)
+	}
+	if plans[0].ListPrice != 20 {
+		t.Fatalf("活动价错误: %v", plans[0].ListPrice)
+	}
+	if !strings.Contains(plans[0].Notes, "Lite/Pro/Max") {
+		t.Fatalf("备注缺少套餐分档说明: %q", plans[0].Notes)
+	}
+	if !strings.Contains(plans[0].Notes, "首单 9 折") {
+		t.Fatalf("备注缺少折扣说明: %q", plans[0].Notes)
+	}
+}
+
+func TestRunZhipuCodingPlanImportDryRunPrintsSummary(t *testing.T) {
+	var out bytes.Buffer
+	err := runZhipuCodingPlanImport(zhipuCodingPlanImportConfig{
+		OverviewFixture:  filepath.Join("testdata", "zhipu_coding_plan_overview_sample.txt"),
+		PromotionFixture: filepath.Join("testdata", "zhipu_coding_plan_promotion_sample.txt"),
+		DryRun:           true,
+	}, nil, &out)
+	if err != nil {
+		t.Fatalf("runZhipuCodingPlanImport 返回错误: %v", err)
+	}
+	output := out.String()
+	for _, want := range []string{
+		"source=zhipu-coding-plan-import",
+		"plans=1",
+		"provider=Zhipu AI",
+		"operator=Zhipu",
+		"dry_run=true",
+	} {
+		if !strings.Contains(output, want) {
+			t.Fatalf("输出缺少 %q，实际: %q", want, output)
+		}
+	}
+}