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_manual_subscription_seed_test.go

@@ -0,0 +1,56 @@
+//go:build llm_script
+
+package main
+
+import (
+	"bytes"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestBuildManualSubscriptionRows(t *testing.T) {
+	envelope, err := loadManualSubscriptionSeed(filepath.Join("..", "seeds", "subscription_plan_manual_seed.json"))
+	if err != nil {
+		t.Fatalf("loadManualSubscriptionSeed 失败: %v", err)
+	}
+
+	rows, err := buildManualSubscriptionRows(envelope)
+	if err != nil {
+		t.Fatalf("buildManualSubscriptionRows 失败: %v", err)
+	}
+	if len(rows) != 3 {
+		t.Fatalf("期望 3 条套餐记录，实际 %d", len(rows))
+	}
+
+	if rows[0].PlanCode != "minimax-token-plan-starter" {
+		t.Fatalf("首条 planCode 错误: %q", rows[0].PlanCode)
+	}
+	if rows[len(rows)-1].PlanCode != "minimax-token-plan-max" {
+		t.Fatalf("末条 planCode 错误: %q", rows[len(rows)-1].PlanCode)
+	}
+}
+
+func TestRunManualSubscriptionImportDryRunPrintsSummary(t *testing.T) {
+	var out bytes.Buffer
+	err := runManualSubscriptionImport(manualSubscriptionImportConfig{
+		SeedPath: filepath.Join("..", "seeds", "subscription_plan_manual_seed.json"),
+		DryRun:   true,
+	}, nil, &out)
+	if err != nil {
+		t.Fatalf("runManualSubscriptionImport 失败: %v", err)
+	}
+
+	output := out.String()
+	for _, want := range []string{
+		"source=manual-subscription-seed",
+		"rows=3",
+		"MiniMax:3",
+		"token_plan:3",
+		"dry_run=true",
+	} {
+		if !strings.Contains(output, want) {
+			t.Fatalf("输出缺少 %q，实际: %q", want, output)
+		}
+	}
+}