feat(gateway): the 5 core gateway routes wired into the router
- src/gateway/routes.rs: /search /schema /call /batch /subscribe - SSE projection: data frames per event, error event terminates, internal/unknown ops -> NOT_FOUND, query-op -> INVALID_OPERATION_TYPE - /search + /schema ACL-filtered via services/list + services/schema discovery handlers; /batch ordered per-item envelope JSON - gateway_router() merged into HttpAdapter's router under the shared bearer-auth route layer; decoy remains the fallback - adapted to alkcall 0.1.1: OperationType::Sub, envelope error by value Verified: cargo test (71 lib tests), clippy -D warnings, fmt.
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