test: migrate ssl and stream route commands to ginkgo e2e - #3

Summary

• migrate ssl and stream-route command coverage from mocked Admin API tests to real Ginkgo E2E coverage
• keep only local unit tests for CLI validation and self-contained logic
• enable stream mode in the local APISIX docker test config so stream-route E2E can run against the real Admin API
• intended as stacked helper PR on the fork because upstream base branches are not writable from the current account

Validation

• go test ./pkg/cmd/ssl/... ./pkg/cmd/streamroute/...
• go test -c -tags e2e ./test/e2e
• go test -tags e2e ./test/e2e -run TestE2E -ginkgo.focus="ssl command" -ginkgo.v
• go test -tags e2e ./test/e2e -run TestE2E -ginkgo.focus="stream-route command" -ginkgo.v