feat: Initial OPHION structure

- Go backend with Fiber framework
- Agent for metrics collection
- Docker Compose for self-hosted
- Auth middleware (JWT + API Keys)
- Rate limiting
- Install script

cmd/server/main.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/cors"
+	"github.com/gofiber/fiber/v2/middleware/logger"
+)
+
+func main() {
+	app := fiber.New(fiber.Config{
+		AppName: "OPHION Observability Platform",
+	})
+
+	// Middleware
+	app.Use(logger.New())
+	app.Use(cors.New())
+
+	// Health check
+	app.Get("/health", func(c *fiber.Ctx) error {
+		return c.JSON(fiber.Map{
+			"status":  "healthy",
+			"service": "ophion",
+			"version": "0.1.0",
+		})
+	})
+
+	// API routes
+	api := app.Group("/api/v1")
+	api.Get("/metrics", getMetrics)
+	api.Post("/metrics", ingestMetrics)
+	api.Get("/logs", getLogs)
+	api.Post("/logs", ingestLogs)
+	api.Get("/alerts", getAlerts)
+
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8080"
+	}
+
+	log.Printf("🐍 OPHION starting on port %s", port)
+	log.Fatal(app.Listen(":" + port))
+}
+
+func getMetrics(c *fiber.Ctx) error {
+	return c.JSON(fiber.Map{"metrics": []string{}})
+}
+
+func ingestMetrics(c *fiber.Ctx) error {
+	return c.JSON(fiber.Map{"status": "received"})
+}
+
+func getLogs(c *fiber.Ctx) error {
+	return c.JSON(fiber.Map{"logs": []string{}})
+}
+
+func ingestLogs(c *fiber.Ctx) error {
+	return c.JSON(fiber.Map{"status": "received"})
+}
+
+func getAlerts(c *fiber.Ctx) error {
+	return c.JSON(fiber.Map{"alerts": []string{}})
+}