Add basic webserver skeleton with healthcheck

internal/handlers/image.go

@@ -0,0 +1,28 @@
+package handlers
+
+import (
+	"net/http"
+)
+
+// HandleImage handles the main image proxy route:
+// /v1/image/<host>/<path>/<width>x<height>.<format>
+func (s *Handlers) HandleImage() http.HandlerFunc {
+	return func(w http.ResponseWriter, req *http.Request) {
+		// FIXME: Implement image proxy handler
+		// - Parse URL to extract host, path, size, format
+		// - Validate signature and expiration
+		// - Check source host whitelist
+		// - Fetch from upstream (with SSRF protection)
+		// - Process image (resize, convert format)
+		// - Cache and serve result
+		panic("unimplemented")
+	}
+}
+
+// HandleRobotsTxt serves robots.txt to prevent search engine crawling
+func (s *Handlers) HandleRobotsTxt() http.HandlerFunc {
+	return func(w http.ResponseWriter, req *http.Request) {
+		// FIXME: Implement robots.txt handler
+		panic("unimplemented")
+	}
+}