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

pkg/tester/session.go

@@ -27,6 +27,8 @@ type Result struct {
 	Source     string   `json:"source"`
 	Screenshot string   `json:"screenshot,omitempty"`
 	Codecs     []string `json:"codecs,omitempty"`
+	Width      uint16   `json:"width,omitempty"`
+	Height     uint16   `json:"height,omitempty"`
 	LatencyMs  int64    `json:"latency_ms,omitempty"`
 	Skipped    bool     `json:"skipped,omitempty"`
 }

pkg/tester/worker.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/AlexxIT/go2rtc/pkg/core"
+	"github.com/AlexxIT/go2rtc/pkg/h264"
 	"github.com/AlexxIT/go2rtc/pkg/magic"
 )
 
@@ -66,18 +67,31 @@ func testURL(s *Session, rawURL string) {
 	latency := time.Since(start).Milliseconds()
 
 	var codecs []string
+	var width, height uint16
+
 	for _, media := range prod.GetMedias() {
 		if media.Direction != core.DirectionRecvonly {
 			continue
 		}
 		for _, codec := range media.Codecs {
 			codecs = append(codecs, codec.Name)
+
+			// extract resolution from first video codec SPS
+			if width == 0 && codec.Name == core.CodecH264 {
+				if spsBytes, _ := h264.GetParameterSet(codec.FmtpLine); spsBytes != nil {
+					if sps := h264.DecodeSPS(spsBytes); sps != nil {
+						width, height = sps.Width(), sps.Height()
+					}
+				}
+			}
 		}
 	}
 
 	r := &Result{
 		Source:    rawURL,
 		Codecs:   codecs,
+		Width:    width,
+		Height:   height,
 		LatencyMs: latency,
 	}