feat(media-supply): add media resource supply marketplace

Introduce an end-to-end media-supply feature: tenant-side resource sync
service/worker backed by a Meijiequan supplier client, ops-side management
APIs, and admin/ops web views for resources, orders, favorites and
submission. Adds a shared digitocr helper, MediaSupply config blocks for
tenant and ops, shared types, and migrations for supplier media resources,
price overrides, customer visibility and order refunds.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/internal/shared/config/config_test.go

@@ -368,6 +368,46 @@ cache:
 	}
 }
 
+func TestLoadAppliesMediaSupplyMeijiequanAccountOverrides(t *testing.T) {
+	t.Setenv("MEIJIEQUAN_USERNAME", " 17788409108 ")
+	t.Setenv("MEIJIEQUAN_PASSWORD", " env-password ")
+	t.Setenv("MEIJIEQUAN_SYNC_PAGE_DELAY", "1500ms")
+	t.Setenv("MEIJIEQUAN_SEARCH_OPTIONS_TTL", "2h")
+	t.Setenv("MEIJIEQUAN_UPSTREAM_MIN_INTERVAL", "3s")
+	t.Setenv("MEDIA_SUPPLY_BACKLINK_SYNC_INTERVAL", "15m")
+	t.Setenv("MEDIA_SUPPLY_BACKLINK_BATCH_SIZE", "12")
+	t.Setenv("MEIJIEQUAN_PUBLISHED_PAGE_SIZE", "30")
+	t.Setenv("MEIJIEQUAN_PUBLISHED_MAX_PAGES", "4")
+
+	configPath := writeTestConfig(t, `
+media_supply:
+  meijiequan:
+    base_url: "http://www.meijiequan.com/"
+    user_id: " 962 "
+    username: config-user
+    password: config-password
+`)
+
+	cfg, err := Load(configPath)
+	if err != nil {
+		t.Fatalf("Load() error = %v", err)
+	}
+
+	if cfg.MediaSupply.Meijiequan.BaseURL != "http://www.meijiequan.com" ||
+		cfg.MediaSupply.Meijiequan.UserID != "962" ||
+		cfg.MediaSupply.Meijiequan.Username != "17788409108" ||
+		cfg.MediaSupply.Meijiequan.Password != "env-password" ||
+		cfg.MediaSupply.Meijiequan.SyncPageDelay != 1500*time.Millisecond ||
+		cfg.MediaSupply.Meijiequan.SearchOptionsTTL != 2*time.Hour ||
+		cfg.MediaSupply.Meijiequan.UpstreamMinInterval != 3*time.Second ||
+		cfg.MediaSupply.Worker.BacklinkSyncInterval != 15*time.Minute ||
+		cfg.MediaSupply.Worker.BacklinkBatchSize != 12 ||
+		cfg.MediaSupply.Meijiequan.PublishedPageSize != 30 ||
+		cfg.MediaSupply.Meijiequan.PublishedMaxPages != 4 {
+		t.Fatalf("unexpected meijiequan config: %#v", cfg.MediaSupply.Meijiequan)
+	}
+}
+
 func TestLoadPrefersEnvSchedulerMetricsSettings(t *testing.T) {
 	t.Setenv("SCHEDULER_HTTP_HOST", "0.0.0.0")
 	t.Setenv("SCHEDULER_INTERNAL_METRICS_TOKEN", "env-metrics-token")