Add multi-module support (Inventory, POS, Cash Flow/AR-AP) + README

[CombatantFawn]

Summary

• Auto-detects business module (Sales, POS, Inventory, Cash Flow/Cartera) and applies the matching glossary/synonyms/hierarchy without mixing terms across modules.
• Adds anonymized reference examples for the 3 new modules (Inventory, Point of Sale, Cash Flow/AR-AP).
• Replaces the placeholder README with the real public-facing one (license section pending legal review).

Test plan

• Step 2A parsing script re-validated against the Ventas dummy JSON — output identical except for expected identifier changes.
• Grepped all reference files for real client names/account IDs — none found.