Update condition handling in FalukantService and syncDatabase utility for legacy data

- Enhanced condition processing in FalukantService to clamp values between 0 and 100, ensuring UI displays valid data.
- Implemented database cleanup in syncDatabase utility to set NULL conditions to 100 and clamp out-of-range values, improving data integrity.

backend/services/falukantService.js

@@ -922,7 +922,8 @@ class FalukantService extends BaseService {
 
             return {
                 id: plain.id,
-                condition: plain.condition,
+                // Defensive: legacy DB rows can have NULL -> UI would display "Unbekannt"
+                condition: Math.max(0, Math.min(100, Number.isFinite(Number(plain.condition)) ? Number(plain.condition) : 100)),
                 availableFrom: plain.availableFrom,
                 status,
                 type: {