Initial commit: Luminary AI Gateway

OpenAI-compatible AI gateway with Vue admin UI, multi-provider egress,
ingress key governance, monitoring, and security controls.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/gateway/model_resolve.go

@@ -0,0 +1,53 @@
+package gateway
+
+import (
+	"encoding/json"
+
+	"github.com/rose_cat707/luminary/internal/model"
+)
+
+// IngressModelID returns the model identifier exposed to ingress clients.
+func IngressModelID(m model.ModelEntry) string {
+	return m.IngressID()
+}
+
+func modelEntryMatches(m model.ModelEntry, name string) bool {
+	return m.MatchesIngressName(name)
+}
+
+func (s *Service) resolveUpstreamModelID(providerID uint, ingressModel string) string {
+	if ingressModel == "" {
+		return ""
+	}
+	for _, m := range s.cache.GetModels(providerID) {
+		if modelEntryMatches(m, ingressModel) {
+			return m.ModelID
+		}
+	}
+	return ingressModel
+}
+
+func rewriteModelInBody(body []byte, upstreamModel string) ([]byte, error) {
+	if upstreamModel == "" || len(body) == 0 {
+		return body, nil
+	}
+	var payload map[string]any
+	if err := json.Unmarshal(body, &payload); err != nil {
+		return body, nil
+	}
+	current, _ := payload["model"].(string)
+	if current == "" || current == upstreamModel {
+		return body, nil
+	}
+	payload["model"] = upstreamModel
+	return json.Marshal(payload)
+}
+
+func (s *Service) rewriteBodyForProvider(providerID uint, body []byte) ([]byte, error) {
+	ingressModel := extractModelName(body)
+	if ingressModel == "" {
+		return body, nil
+	}
+	upstream := s.resolveUpstreamModelID(providerID, ingressModel)
+	return rewriteModelInBody(body, upstream)
+}