feat(gateway): wire real services into Gateway API handlers

- Router accepts full Dependencies (memory/voice/orchestrator/WShub)
- Memory API: CRUD + search endpoints with PostgreSQL persistence
- Voice API: STT/TTS endpoints
- Admin dashboard: real uptime + service status
- WebSocket chat: routes to AI-Core orchestrator pipeline
- APIAdapter bridges memory domain model to REST interface
- Smoke test: memory CRUD + session creation verified

backend/services/gateway/api/router_test.go

@@ -8,7 +8,7 @@ import (
 )
 
 func TestHealth(t *testing.T) {
-	r := New(NewStubAuthManager())
+	r := New(Dependencies{AuthMgr: NewStubAuthManager()})
 	srv := httptest.NewServer(r)
 	defer srv.Close()
 
@@ -25,7 +25,7 @@ func TestHealth(t *testing.T) {
 
 func TestLoginAndProtectedEndpoint(t *testing.T) {
 	auth := NewStubAuthManager()
-	r := New(auth)
+	r := New(Dependencies{AuthMgr: auth})
 	srv := httptest.NewServer(r)
 	defer srv.Close()
 
@@ -57,7 +57,7 @@ func TestLoginAndProtectedEndpoint(t *testing.T) {
 
 func TestLoginWrongPassword(t *testing.T) {
 	auth := NewStubAuthManager()
-	r := New(auth)
+	r := New(Dependencies{AuthMgr: auth})
 	srv := httptest.NewServer(r)
 	defer srv.Close()
 
@@ -75,7 +75,7 @@ func TestLoginWrongPassword(t *testing.T) {
 
 func TestProtectedWithoutToken(t *testing.T) {
 	auth := NewStubAuthManager()
-	r := New(auth)
+	r := New(Dependencies{AuthMgr: auth})
 	srv := httptest.NewServer(r)
 	defer srv.Close()
 
@@ -115,7 +115,7 @@ func TestStubAuthManager(t *testing.T) {
 }
 
 func TestCORSHeaders(t *testing.T) {
-	r := New(NewStubAuthManager())
+	r := New(Dependencies{AuthMgr: NewStubAuthManager()})
 	srv := httptest.NewServer(r)
 	defer srv.Close()