Initial iris repository structure

WASM reactive UI framework for Go:
- reactive/ - Signal[T], Effect, Runtime
- ui/ - Button, Text, Input, View, Canvas, SVG components
- navigation/ - Router, guards, history management
- auth/ - OIDC client for WASM applications
- host/ - Static file server

Extracted from arcadia as open-source component.

Co-Authored-By: Claude <noreply@anthropic.com>

ui/text.go

@@ -0,0 +1,23 @@
+package ui
+
+import (
+	"git.flowmade.one/flowmade-one/iris/internal/element"
+	"git.flowmade.one/flowmade-one/iris/reactive"
+)
+
+func TextFromString(text string) View {
+	v := View{element.NewElement("p")}
+	v.e.Set("textContent", text)
+	return v
+}
+
+func TextFromFunction(fn func() string) View {
+	textNode := element.NewElement("p")
+
+	reactive.NewEffect(func() {
+		value := fn()
+		textNode.Set("textContent", value)
+	})
+
+	return View{textNode}
+}