Enhance e2e test with HTTP/2 and gRPC protocol coverage

- Add multi-domain test: whoami (HTTP/1.1) + grpcbin (gRPC/H2) backends
- Use ROUTING_MAP with SNI-based routing to test multi-backend support
- Add comma-separated ROUTING_MAP parsing (phala CLI -e flattens newlines)
- Test HTTP/2 against h2c-capable backend (grpcbin), not HTTP/1.1-only whoami
- Verify gRPC reflection, unary call, and SNI routing separation
- All 17 tests pass on live Phala CVM deployment

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: h4x3rotab

custom-domain/dstack-ingress/scripts/entrypoint.sh

@@ -182,6 +182,10 @@ EVIDENCE_BLOCK
     fi
 
     # Parse ROUTING_MAP and generate use_backend rules + backend sections
+    # Support both newline-separated and comma-separated formats
+    local routing_map_normalized
+    routing_map_normalized=$(echo "$ROUTING_MAP" | tr ',' '\n')
+
     local backend_rules=""
     local backend_sections=""
     local first_be_name=""
@@ -211,7 +215,7 @@ EVIDENCE_BLOCK
 
 backend ${be_name}
     server s1 ${target}"
-    done <<< "$ROUTING_MAP"
+    done <<< "$routing_map_normalized"
 
     echo "$backend_rules" >> /etc/haproxy/haproxy.cfg