Add smart cache lookup templates with AUTO_SKIP_SYNC support

New templates for advanced sync caching:
- .haf_app_smart_cache_lookup: Handles QUICK_TEST mode, AUTO_SKIP_SYNC
  mode, and searches for compatible app caches when only tests/docs changed
- .haf_app_sync_save_cache_conditional: Only saves to cache when
  CACHE_HIT is false (avoids re-saving loaded data)

These enable apps like balance_tracker to skip sync entirely when a
compatible cache exists, significantly speeding up test-only pipelines.