feat: complete drug-aware indication matching and cleanup app_v2

- Remove app_v2.py (consolidated into pathways_app.py), fix __init__ import
- Add DimSearchTerm.csv, drug_indication_clusters.csv, drug_snomed_mapping_enriched.csv
  as reference data for SNOMED-based indication matching
- Add snomed_indication_mapping_query.sql (source for embedded cluster mapping)
- Update DESIGN_SYSTEM.md, RALPH_PROMPT.md, ralph.ps1, uv.lock

.claude/settings.local.json

@@ -5,7 +5,9 @@
       "Bash(wc:*)",
       "WebFetch(domain:flet.dev)",
       "WebFetch(domain:github.com)",
-      "WebFetch(domain:docs.flet.dev)"
+      "WebFetch(domain:docs.flet.dev)",
+      "Bash(python -c:*)",
+      "Bash(Remove-Item -Path \"C:\\\\Users\\\\charlwoodand\\\\Ralph local\\\\Tasks\\\\UI Redesign\\\\logs\\\\*\" -Force)"
     ]
   }
 }