feat: initial open-source release of Pipely

OTA update server designed for high-concurrency, low-bandwidth deployments.
GORM-backed PostgreSQL, JWT auth, device management, artefact versioning,
deployment rollout with gated rate-limited downloads, and a React admin panel.

internal/middleware/auth.go

@@ -0,0 +1,34 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"onixbyte.com/message-converter-manifest/internal/auth"
+)
+
+func AuthMiddleware(authSvc *auth.Service) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		authHeader := c.GetHeader("Authorization")
+		if authHeader == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Authorisation header is missing"})
+			return
+		}
+
+		parts := strings.SplitN(authHeader, " ", 2)
+		if !(len(parts) == 2 && parts[0] == "Bearer") {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Invalid authorisation format"})
+			return
+		}
+
+		user, err := authSvc.ValidateToken(parts[1])
+		if err != nil {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Unauthorised: " + err.Error()})
+			return
+		}
+
+		c.Set("user", user)
+		c.Next()
+	}
+}