feat: Migrate from Socket.IO to Server-Sent Events (SSE)

- Replace Socket.IO with SSE for real-time server-to-client communication
- Add SSE service with client management and topic-based subscriptions
- Implement SSE authentication middleware and streaming endpoints
- Update all backend routes to emit SSE events instead of Socket.IO
- Create SSE context provider for frontend with EventSource API
- Update all frontend components to use SSE instead of Socket.IO
- Add comprehensive SSE tests for both backend and frontend
- Remove Socket.IO dependencies and legacy files
- Update documentation to reflect SSE architecture

Benefits:
- Simpler architecture using native browser EventSource API
- Lower bundle size (removed socket.io-client dependency)
- Better compatibility with reverse proxies and load balancers
- Reduced resource usage for Raspberry Pi deployment
- Standard HTTP-based real-time communication

🤖 Generated with [AI Assistant]

Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

deploy/k8s/ingress.yaml

@@ -2,7 +2,6 @@ apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
   name: adopt-a-street-ingress
-  namespace: adopt-a-street
   annotations:
     # Uncomment the appropriate ingress class for your cluster
     kubernetes.io/ingress.class: "haproxy"   # For HAProxy Ingress
@@ -15,8 +14,9 @@ metadata:
     # traefik.ingress.kubernetes.io/router.entrypoints: web,websecure
     # traefik.ingress.kubernetes.io/router.middlewares: default-redirect-https@kubernetescrd
 spec:
+  ingressClassName: haproxy
   rules:
-    - host: adopt-a-street.local  # CHANGE THIS to your actual domain
+    - host: app.adopt-a-street.192.168.153.241.nip.io  # CHANGE THIS to your actual domain
       http:
         paths:
           # API endpoints