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/seed_test.go

@@ -0,0 +1,57 @@
+package server
+
+import (
+	"path/filepath"
+	"testing"
+
+	"task/internal/sqlite"
+)
+
+func TestSeedDemo(t *testing.T) {
+	db, err := sqlite.Open(filepath.Join(t.TempDir(), "seed.db"), []byte("s"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	if _, err := db.CreateUser("admin", "admin", true); err != nil {
+		t.Fatal(err)
+	}
+	srv := New(db)
+	if err := srv.SeedDemo(); err != nil {
+		t.Fatal(err)
+	}
+	projects, err := srv.Projects.List()
+	if err != nil || len(projects) < 3 {
+		t.Fatalf("projects=%v err=%v", projects, err)
+	}
+	var testID string
+	for _, p := range projects {
+		if p.Name == "Test" {
+			testID = p.ID
+			break
+		}
+	}
+	if testID == "" {
+		t.Fatal("missing Test project")
+	}
+	sync, err := srv.Projects.GetSyncBackend(testID)
+	if err != nil || sync.Kind != "none" {
+		t.Fatalf("sync=%+v err=%v", sync, err)
+	}
+	tickets, err := srv.Tickets.List(testID)
+	if err != nil || len(tickets) == 0 {
+		t.Fatalf("tickets empty")
+	}
+	conns, err := db.ListConnections()
+	if err != nil || len(conns) != 0 {
+		t.Fatalf("expected no remote connections, got %v", conns)
+	}
+	// idempotent when projects already exist
+	if err := srv.SeedDemo(); err != nil {
+		t.Fatal(err)
+	}
+	projects2, _ := srv.Projects.List()
+	if len(projects2) != len(projects) {
+		t.Fatalf("re-seed changed project count")
+	}
+}