Add Thai utilities investment CSV with supplier candidates and budgetary ranges

Steam, compressed air, cooling, water treatment, racking, HVAC, solar EPC
and BESS; baseline total 23.98M-41.63M THB, options priced separately;
all figures budgetary +/- 30%, basis marked per row

docs/suppliers/equipment-suppliers.md

@@ -166,7 +166,10 @@ Open: identify and qualify Thai/regional PVC compound producers.
 - Clean rooms, ventilation, decontamination infrastructure for galvanics
 - Fire protection, exhaust work benches, PPE stock
 
-Suppliers: all open, to be sourced locally in Thailand where possible.
+Thai supplier candidates and rough investment ranges for these utility and
+site systems are compiled in
+[`../finance/utilities-investment.csv`](../finance/utilities-investment.csv)
+(budgetary figures, plus or minus 30%, researched July 2026).
 
 ## 9. Services and Expertise