feat: Phase 2 triage with keyboard shortcuts J/S/X

Implement /triage GET/POST routes in triage.py blueprint; render
phase2.html with day-grouped photo grid, Alpine.js keyboard tagging
(J=journal, S=story, X/Space=skip), and done-button gated on all-tagged.
Remove stub from albums.py; register triage.bp in __init__.py.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/travel-memories/app/routes/albums.py

@@ -70,22 +70,3 @@ def select():
     save_state(state, current_app)
     return redirect(f"/triage?album_id={primary_id}")
 
-
-# TODO(task-6): replace this stub with the real triage route
-@bp.get("/triage")
-def triage():
-    album_id = request.args.get("album_id", "")
-    notes_content = ""
-    phase_stale = []
-    if album_id:
-        state = load_state(album_id, current_app)
-        if state:
-            notes_content = state.notes
-            phase_stale = state.phase_stale
-    return render_template(
-        "base.html",
-        current_phase="triage",
-        album_id=album_id,
-        notes_content=notes_content,
-        phase_stale=phase_stale,
-    )