Add scalability architecture diagram

scalability/calculations.md

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+# Scalability Calculation
+
+## Given
+
+Incoming traffic = 15,000 requests/second
+
+Container capacity = 500 requests/second
+
+Safety margin = 30%
+
+---
+
+## Step 1
+
+Minimum containers required:
+
+15000 / 500 = 30 containers
+
+---
+
+## Step 2
+
+Add a 30% safety margin:
+
+30 × 1.30 = 39 containers
+
+---
+
+## Final Result
+
+Required containers = **39**
+
+This deployment can safely handle 15,000 requests per second while providing additional capacity for traffic spikes and failover.