feat: Use technology difficulty factor as 100

Author: Clashsoft

src/empire/empire.service.ts

@@ -143,6 +143,7 @@ export class EmpireService extends MongooseRepository<Empire> {
 
   async aggregateTechCost(empire: Empire, technology: Technology): Promise<AggregateResult> {
     const variables: Partial<Record<Variable, number>> = {
+      'empire.technologies.difficulty': EMPIRE_VARIABLES.technologies.difficulty,
       'empire.technologies.cost_multiplier': EMPIRE_VARIABLES.technologies.cost_multiplier,
     };
     for (const tag of technology.tags) {

src/game-logic/empire-variables.ts

@@ -11,7 +11,7 @@ export const EMPIRE_VARIABLES = {
     },
   },
   technologies: {
-    difficulty: 1, // global variable to control tech tree difficulty
+    difficulty: 100, // global variable to control tech tree difficulty
     cost_multiplier: 0.95, // cost reduction for previously unlocked techs
   },
 } as const;