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/prediction/inject.go

@@ -0,0 +1,48 @@
+package prediction
+
+import (
+	"crypto/rand"
+	"encoding/json"
+	"fmt"
+	"math/big"
+)
+
+func BuildPrompt(workflowJSON string, binding InputBinding, input map[string]any) (map[string]any, error) {
+	var workflow map[string]any
+	if err := json.Unmarshal([]byte(workflowJSON), &workflow); err != nil {
+		return nil, fmt.Errorf("invalid workflow: %w", err)
+	}
+	prompt := deepCopyMap(workflow)
+	for name, target := range binding {
+		if target == nil || target.Node == "" || target.Field == "" {
+			continue
+		}
+		val, ok := input[name]
+		if !ok {
+			continue
+		}
+		if name == "seed" {
+			if iv, ok := val.(int); ok && iv < 0 {
+				n, _ := rand.Int(rand.Reader, big.NewInt(1<<31-1))
+				val = int(n.Int64())
+			}
+		}
+		node, ok := prompt[target.Node].(map[string]any)
+		if !ok {
+			return nil, fmt.Errorf("node %s not found", target.Node)
+		}
+		inputs, ok := node["inputs"].(map[string]any)
+		if !ok {
+			return nil, fmt.Errorf("node %s inputs missing", target.Node)
+		}
+		inputs[target.Field] = val
+	}
+	return prompt, nil
+}
+
+func deepCopyMap(src map[string]any) map[string]any {
+	b, _ := json.Marshal(src)
+	var dst map[string]any
+	_ = json.Unmarshal(b, &dst)
+	return dst
+}