Add request logging middleware and improve startup diagnostics

- Request logger middleware logs method, path, status, duration
  for all non-static/health requests (those go to debug level)
- Initial fetch complete log now includes repo and doc counts
- Helps diagnose deployment and routing issues

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/server/server.go

@@ -93,6 +93,7 @@ func New(cfg Config) (*Server, error) {
 // Handler returns the chi router with all routes mounted.
 func (s *Server) Handler() http.Handler {
 	r := chi.NewRouter()
+	r.Use(s.requestLogger)
 
 	staticFS, err := fs.Sub(web.Content, "static")
 	if err != nil {
@@ -327,6 +328,43 @@ func (s *Server) renderError(w http.ResponseWriter, r *http.Request, code int, m
 	s.render(w, r, "error.html", data, code)
 }
 
+type statusWriter struct {
+	http.ResponseWriter
+	code int
+}
+
+func (w *statusWriter) WriteHeader(code int) {
+	w.code = code
+	w.ResponseWriter.WriteHeader(code)
+}
+
+func (s *Server) requestLogger(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		sw := &statusWriter{ResponseWriter: w, code: http.StatusOK}
+		next.ServeHTTP(sw, r)
+		duration := time.Since(start)
+
+		// Skip static assets and health checks at info level
+		if strings.HasPrefix(r.URL.Path, "/static/") || r.URL.Path == "/health" {
+			s.log.Debug("request",
+				"method", r.Method,
+				"path", r.URL.Path,
+				"status", sw.code,
+				"duration", duration,
+			)
+			return
+		}
+
+		s.log.Info("request",
+			"method", r.Method,
+			"path", r.URL.Path,
+			"status", sw.code,
+			"duration", duration,
+		)
+	})
+}
+
 func verifyHMAC(body []byte, signature, secret string) bool {
 	if signature == "" {
 		return false
@@ -393,7 +431,12 @@ func StartBackgroundFetch(ctx context.Context, cfg BackgroundConfig) {
 			}
 		}
 		cfg.Cache.SetReady()
-		log.Info("initial fetch complete")
+		repos := cfg.Cache.ListRepos()
+		totalDocs := 0
+		for _, r := range repos {
+			totalDocs += len(r.Docs)
+		}
+		log.Info("initial fetch complete", "repos", len(repos), "docs", totalDocs)
 		break
 	}