feat(sol): add agave-backed dlob hot path for canary

environments/sol/trade-infra/README.md

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+# trade-infra
+
+Shared host-backed services for the `sol` cluster.
+
+## Purpose
+
+- Expose host services into `k3s` through stable service names in namespace `trade-infra`.
+- Keep host access paths reproducible in Git instead of relying on manual `kubectl` history.
+- Provide cluster DNS names for:
+  - `Postgres`
+  - `Redis`
+  - `agave` RPC
+  - `agave` websocket
+  - `agave` Yellowstone gRPC
+
+## Operator Flow
+
+From the repository root:
+
+```bash
+./environments/sol/trade-infra/scripts/prepare-sol-agave-access.sh
+kubectl apply -k environments/sol/trade-infra
+```
+
+`prepare-sol-agave-access.sh` installs host-level socket proxies on `sol` so pods can reach the private validator endpoints through the host IP `149.50.96.162`.