Rewrite Strix from scratch as single binary

Complete architecture rewrite following go2rtc patterns:
- pkg/ for pure logic (camdb, tester, probe, generate)
- internal/ for application glue with Init() modules
- Single HTTP server on :4567 with all endpoints
- zerolog with password masking and memory ring buffer
- Environment-based config only (no YAML files)

API endpoints: /api/search, /api/streams, /api/test,
/api/probe, /api/generate, /api/health, /api/log

Dependencies: go2rtc v1.9.14, go-sqlite3, miekg/dns, zerolog

pkg/probe/http.go

@@ -0,0 +1,65 @@
+package probe
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"net/http"
+)
+
+func ProbeHTTP(ctx context.Context, ip string, ports []int) (*HTTPResult, error) {
+	if len(ports) == 0 {
+		ports = []int{80, 8080}
+	}
+
+	client := &http.Client{
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+		},
+	}
+
+	type result struct {
+		resp *http.Response
+		port int
+	}
+
+	ch := make(chan result, len(ports))
+
+	for _, port := range ports {
+		go func(port int) {
+			url := fmt.Sprintf("http://%s:%d/", ip, port)
+			req, err := http.NewRequestWithContext(ctx, "HEAD", url, nil)
+			if err != nil {
+				return
+			}
+			req.Header.Set("User-Agent", "Strix/2.0")
+
+			resp, err := client.Do(req)
+			if err != nil {
+				return
+			}
+			ch <- result{resp: resp, port: port}
+		}(port)
+	}
+
+	for range ports {
+		select {
+		case <-ctx.Done():
+			return nil, nil
+		case r := <-ch:
+			if r.resp.Body != nil {
+				r.resp.Body.Close()
+			}
+			return &HTTPResult{
+				Port:       r.port,
+				StatusCode: r.resp.StatusCode,
+				Server:     r.resp.Header.Get("Server"),
+			}, nil
+		}
+	}
+
+	return nil, nil
+}