Add EmergencyService app — ZZS Praha, Legerova

[melvincarvalho]

Single app PR.

• emergency-service.html (EmergencyService): name, image, description, address, telephone, url. Accent #dc2626. Icon 🚨. Sample: ZZS Praha, Prague's municipal ambulance service, 13 stations, 62 ambulances, 12 rapid-response Škoda Superbs, 1400 staff, 1200 calls/day, central dispatch on Legerova in a 1937 functionalist depot, 90-second category A response, Charles University emergency medicine residency.

Gate: 323 apps pass. Batch 3 task 33/100.