feat(traefik): Add Gitea service definition for Traefik

- Add gitea-service.yml with proper timeout configuration
- Service definition required for Traefik to route to Gitea
- Replaces old gitea.yml file that was removed

deployment/stacks/traefik/dynamic/gitea-service.yml

@@ -0,0 +1,20 @@
+# Gitea Service Configuration
+# Service definition with proper timeouts for slow responses
+
+http:
+  services:
+    gitea:
+      loadBalancer:
+        servers:
+          - url: http://gitea:3000
+        # Health check configuration
+        healthCheck:
+          path: /api/healthz
+          interval: 30s
+          timeout: 10s
+          scheme: http
+        # Response forwarding - flush immediately to stream responses
+        responseForwarding:
+          flushInterval: 0s
+        # Pass host header to backend
+        passHostHeader: true