Add frontend pages, move static to www/, add resolution to tester

Frontend:
- index.html: probe device, navigate to standard/homekit by type
- standard.html: camera config, model search with multi-select
- create.html: stream URL list, custom URL input, create test session
- homekit.html: HomeKit device info, contact links, fallback to standard

Backend:
- Move static files to www/ package with embed (go2rtc pattern)
- Add initStatic() in api with FileServer
- Add width/height to test results from H264 SPS parsing
- Contribute links to gostrix.github.io with auto-filled params

internal/api/static.go

@@ -0,0 +1,16 @@
+package api
+
+import (
+	"net/http"
+
+	"github.com/eduard256/strix/www"
+)
+
+func initStatic() {
+	root := http.FS(www.Static)
+	fileServer := http.FileServer(root)
+
+	HandleFunc("", func(w http.ResponseWriter, r *http.Request) {
+		fileServer.ServeHTTP(w, r)
+	})
+}