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_ppio_pricing_test.go

@@ -0,0 +1,55 @@
+//go:build llm_script
+
+package main
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestParsePPIOPricingCatalogBuildsRecords(t *testing.T) {
+	raw, err := os.ReadFile(filepath.Join("testdata", "ppio_pricing_sample.txt"))
+	if err != nil {
+		t.Fatalf("读取 fixture 失败: %v", err)
+	}
+
+	records, err := parsePPIOPricingCatalog(string(raw))
+	if err != nil {
+		t.Fatalf("parsePPIOPricingCatalog 返回错误: %v", err)
+	}
+	if len(records) != 5 {
+		t.Fatalf("期望 5 条 PPIO 价格记录，实际 %d", len(records))
+	}
+	if records[0].InputPrice != 2 {
+		t.Fatalf("deepseek-v3.1 输入价错误: %v", records[0].InputPrice)
+	}
+	if records[1].OutputPrice != 16 {
+		t.Fatalf("deepseek-r1 输出价错误: %v", records[1].OutputPrice)
+	}
+}
+
+func TestRunPPIOPricingImportDryRunPrintsSummary(t *testing.T) {
+	var out bytes.Buffer
+	err := runPPIOPricingImport(ppioPricingImportConfig{
+		URL:     defaultPPIOPricingURL,
+		Fixture: filepath.Join("testdata", "ppio_pricing_sample.txt"),
+		DryRun:  true,
+	}, nil, &out)
+	if err != nil {
+		t.Fatalf("runPPIOPricingImport 返回错误: %v", err)
+	}
+	output := out.String()
+	for _, want := range []string{
+		"source=ppio-pricing-import",
+		"models=5",
+		"operator=PPIO Model API",
+		"dry_run=true",
+	} {
+		if !strings.Contains(output, want) {
+			t.Fatalf("输出缺少 %q，实际: %q", want, output)
+		}
+	}
+}