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/handler/files/handler.go

@@ -0,0 +1,43 @@
+package files
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"github.com/rose_cat707/luminary/internal/storage/imagestore"
+)
+
+type Handler struct {
+	store *imagestore.Store
+}
+
+func New(store *imagestore.Store) *Handler {
+	return &Handler{store: store}
+}
+
+func (h *Handler) Register(r *gin.Engine) {
+	r.GET("/files/:id", h.Serve)
+}
+
+func (h *Handler) Serve(c *gin.Context) {
+	id := c.Param("id")
+	expStr := c.Query("exp")
+	sig := c.Query("sig")
+	exp, err := strconv.ParseInt(expStr, 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid exp"})
+		return
+	}
+	if !h.store.Verify(id, exp, sig) {
+		c.JSON(http.StatusForbidden, gin.H{"error": "invalid signature"})
+		return
+	}
+	img, err := h.store.Get(id)
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "not found"})
+		return
+	}
+	c.Header("Content-Type", img.Mime)
+	c.File(img.LocalPath)
+}