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/ui/helpbar.go

@@ -34,7 +34,7 @@ func (m Model) helpEntries() []helpEntry {
 			{"enter", "select"},
 			{"n", "new project"},
 			{"e", "edit"},
-			{"Y", "YouTrack"},
+			{"Y", "Sync"},
 			{"x", "delete"},
 			{"X", "force delete"},
 			{"esc", "cancel"},
@@ -121,7 +121,7 @@ func (m Model) helpEntries() []helpEntry {
 			{"t/T", "timer/log"},
 			{"m", "entries"},
 			{"r", "report"},
-			{"Y", "YouTrack"},
+			{"Y", "Sync"},
 			{"u/U", "undo/redo"},
 			{"/", "search"},
 			{"p", "project"},