Add Emberwake Cloud Ecosystem deploy hub with AWS and generic spread templates.

Unified expandable panels with mermaid flows, ZIP export, connection tests, and Playwright smoke coverage.

server/internal/api/spread_handler.go

@@ -23,7 +23,10 @@ type SpreadHandler struct {
 	dataDir       string
 	projectRoot   string
 	wsHub         *WSHub
+	publicURL     func() string
 	erasureShards *erasure.ShardStore
+	deployPlan    *DeployPlanHandler
+	s3CRRConfigFn func() erasure.S3ShardConfig
 	notesMu       sync.RWMutex
 }
 
@@ -33,6 +36,36 @@ func (h *SpreadHandler) BindErasureShards(store *erasure.ShardStore) {
 	}
 }
 
+func (h *SpreadHandler) BindDeployPlan(handler *DeployPlanHandler) {
+	if h != nil {
+		h.deployPlan = handler
+	}
+}
+
+func (h *SpreadHandler) BindS3CRRConfig(fn func() erasure.S3ShardConfig) {
+	if h != nil {
+		h.s3CRRConfigFn = fn
+	}
+}
+
+// GET /api/v1/spread/aws-s3-crr-template — operator-applied CRR JSON (no AWS API calls).
+func (h *SpreadHandler) GetS3CRRTemplate(w http.ResponseWriter, r *http.Request) {
+	if h == nil || h.s3CRRConfigFn == nil {
+		http.Error(w, "s3 crr not configured", http.StatusServiceUnavailable)
+		return
+	}
+	doc, err := erasure.BuildS3CRRRule(h.s3CRRConfigFn())
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	writeJSON(w, map[string]interface{}{
+		"template": "templates/spread/aws/s3-crr-rule.json",
+		"rule":     doc,
+		"notes":    "Apply via S3 console or CLI; enables cross-region shard epidemic replication under shards/",
+	})
+}
+
 func NewSpreadHandler(database *dbpkg.Database, dataDir, projectRoot string, wsHub *WSHub) *SpreadHandler {
 	return &SpreadHandler{db: database, dataDir: dataDir, projectRoot: projectRoot, wsHub: wsHub}
 }