Add tm_server with SQLite, Svelte UI, and task-master TUI sync.

Introduces the web backend (auth, RBAC, project tokens, revisions),
YouTrack-or-taskmaster backend choice in the TUI, and a first-pass
embedded Svelte UI. The frontend is functional but needs a major rework.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/server/import_json_test.go

@@ -0,0 +1,55 @@
+package server
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"task/internal/project"
+	"task/internal/sqlite"
+	"task/internal/ticket"
+)
+
+func TestImportJSONDataDir(t *testing.T) {
+	dataDir := t.TempDir()
+	ps := project.NewDirStore(dataDir)
+	if err := ps.Ensure("inbox"); err != nil {
+		t.Fatal(err)
+	}
+	ts := ticket.NewJSONStore(dataDir)
+	created, err := ts.Create(ticket.Ticket{Title: "From JSON", ProjectID: "inbox"})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dbPath := filepath.Join(t.TempDir(), "import.db")
+	db, err := sqlite.Open(dbPath, []byte("sec"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	u, err := db.CreateUser("admin", "x", true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	srv := New(db)
+	if err := srv.ImportJSONDataDir(dataDir, u.ID); err != nil {
+		t.Fatal(err)
+	}
+	got, err := srv.Tickets.Get(created.ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got.Title != "From JSON" {
+		t.Fatalf("title=%q", got.Title)
+	}
+	role, _ := db.MemberRole("inbox", u.ID)
+	if role != sqlite.RoleOwner {
+		t.Fatalf("role=%s", role)
+	}
+	// second import is idempotent
+	if err := srv.ImportJSONDataDir(dataDir, u.ID); err != nil {
+		t.Fatal(err)
+	}
+	_ = os.RemoveAll(dataDir) // ensure we don't rely on JSON after import for this test cleanup
+}