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/ticket/ticket.go

@@ -53,6 +53,8 @@ func (s Status) Index() int {
 const (
 	// SourceYouTrack marks tickets imported from YouTrack.
 	SourceYouTrack = "youtrack"
+	// SourceTaskMaster marks tickets synced from a task-master server.
+	SourceTaskMaster = "taskmaster"
 )
 
 // Ticket is the domain model for a work item.