docs: cleanup stale documentation and fix outdated references

- Delete README-ORACLE-MODES.md (references Docker infra that doesn't exist)
- Delete .claude/HANDOFF.md (completed CI/CD session handoff, no longer needed)
- Fix api/README.md: correct run command to ./start.sh, update test commands
  to use ./test.sh instead of deleted test_app_basic.py/test_integration.py
- Fix scripts/HANDOFF_MAPPING.md: mark deleted scripts as removed
- Remove dead README-ORACLE-MODES.md link from README doc table

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -456,7 +456,6 @@ curl -X POST http://localhost:5003/api/dashboard/refresh-invoices
 | [docs/oracle-schema-notes.md](docs/oracle-schema-notes.md) | Schema Oracle: tabele comenzi, facturi, preturi, proceduri cheie |
 | [docs/pack_facturare_analysis.md](docs/pack_facturare_analysis.md) | Analiza flow facturare: call chain, parametri, STOC lookup, FACT-008 |
 | [scripts/HANDOFF_MAPPING.md](scripts/HANDOFF_MAPPING.md) | Matching GoMag SKU → ROA articole (strategie si rezultate) |
-| [README-ORACLE-MODES.md](README-ORACLE-MODES.md) | Configurare Oracle thick/thin mode cu Docker |
 
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