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/auth/handler.go

@@ -0,0 +1,32 @@
+package auth
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"onixbyte.com/message-converter-manifest/internal/model"
+)
+
+type Handler struct {
+	svc *Service
+}
+
+func NewHandler(svc *Service) *Handler {
+	return &Handler{svc: svc}
+}
+
+func (h *Handler) Login(c *gin.Context) {
+	var req model.LoginRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request: " + err.Error()})
+		return
+	}
+
+	resp, err := h.svc.Login(req.Username, req.Password)
+	if err != nil {
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid credentials"})
+		return
+	}
+
+	c.JSON(http.StatusOK, resp)
+}