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/project/meta.go

@@ -10,6 +10,12 @@ import (
 
 const metaFileName = "meta.json"
 
+const (
+	BackendNone       = "none"
+	BackendYouTrack   = "youtrack"
+	BackendTaskMaster = "taskmaster"
+)
+
 // YouTrack holds remote sync settings for a project.
 type YouTrack struct {
 	BaseURL    string `json:"baseUrl"`
@@ -34,9 +40,59 @@ func (y YouTrack) IssueQuery() string {
 	return "project: " + strings.TrimSpace(y.ProjectKey)
 }
 
+// TaskMaster holds sync settings for a remote tm_server project.
+type TaskMaster struct {
+	BaseURL   string `json:"baseUrl"`
+	Token     string `json:"token"`
+	ProjectID string `json:"projectId"`
+}
+
+// Configured reports whether task-master sync can run.
+func (t TaskMaster) Configured() bool {
+	return strings.TrimSpace(t.BaseURL) != "" &&
+		strings.TrimSpace(t.Token) != "" &&
+		strings.TrimSpace(t.ProjectID) != ""
+}
+
 // Meta is per-project metadata stored beside tickets.json.
 type Meta struct {
-	YouTrack *YouTrack `json:"youtrack,omitempty"`
+	Backend    string      `json:"backend,omitempty"` // none|youtrack|taskmaster
+	YouTrack   *YouTrack   `json:"youtrack,omitempty"`
+	TaskMaster *TaskMaster `json:"taskmaster,omitempty"`
+}
+
+// EffectiveBackend returns the sync backend kind, with legacy youtrack inference.
+func (m Meta) EffectiveBackend() string {
+	b := strings.TrimSpace(strings.ToLower(m.Backend))
+	switch b {
+	case BackendYouTrack, BackendTaskMaster, BackendNone:
+		return b
+	}
+	if m.YouTrack != nil && m.YouTrack.Configured() {
+		return BackendYouTrack
+	}
+	if m.TaskMaster != nil && m.TaskMaster.Configured() {
+		return BackendTaskMaster
+	}
+	if m.YouTrack != nil {
+		return BackendYouTrack
+	}
+	if m.TaskMaster != nil {
+		return BackendTaskMaster
+	}
+	return BackendNone
+}
+
+// SyncConfigured reports whether the active backend is fully set up.
+func (m Meta) SyncConfigured() bool {
+	switch m.EffectiveBackend() {
+	case BackendYouTrack:
+		return m.YouTrack != nil && m.YouTrack.Configured()
+	case BackendTaskMaster:
+		return m.TaskMaster != nil && m.TaskMaster.Configured()
+	default:
+		return false
+	}
 }
 
 func (s *DirStore) metaPath(id string) string {
@@ -63,6 +119,12 @@ func (s *DirStore) LoadMeta(id string) (Meta, error) {
 	if err := json.Unmarshal(data, &meta); err != nil {
 		return Meta{}, fmt.Errorf("parse meta %s: %w", id, err)
 	}
+	if meta.Backend == "" && meta.YouTrack != nil {
+		meta.Backend = BackendYouTrack
+	}
+	if meta.Backend == "" && meta.TaskMaster != nil {
+		meta.Backend = BackendTaskMaster
+	}
 	return meta, nil
 }
 
@@ -74,6 +136,9 @@ func (s *DirStore) SaveMeta(id string, meta Meta) error {
 	if err := s.Ensure(id); err != nil {
 		return err
 	}
+	if meta.Backend == "" {
+		meta.Backend = meta.EffectiveBackend()
+	}
 	path := s.metaPath(id)
 	data, err := json.MarshalIndent(meta, "", "  ")
 	if err != nil {