feat: Notes core service + Notes API + router auto-detect notes context
- Add internal/core/notes/ service (Service, Layout, Normalize, tests)
- Register verstak/core/notes/v1 capability
- Inject NotesService into App, expose 8 Notes API endpoints
(CreateNote, RenameNote, ReadNote, SaveNote, EnsureOverview,
ListNotes, SearchNotes, NormalizeNoteTitle)
- Router: auto-detect Notes context via path (IsInsideNotes)
- PluginCard: show workspaceItems contribution count
- Regenerate Wails bindings (App.d.ts, App.js, models.ts with notes.NoteInfo)
- Fix .gitignore pattern for e2e-results/