feat: Add Max Bitrate option (#3628)

src/config.cpp

@@ -509,7 +509,8 @@ namespace config {
       {}  // wa
     },  // display_device
 
-    1  // min_fps_factor
+    1,  // min_fps_factor
+    0  // max_bitrate
   };
 
   audio_t audio {
@@ -1138,6 +1139,7 @@ namespace config {
     bool_f(vars, "dd_wa_hdr_toggle", video.dd.wa.hdr_toggle);
 
     int_between_f(vars, "min_fps_factor", video.min_fps_factor, {1, 3});
+    int_f(vars, "max_bitrate", video.max_bitrate);
 
     path_f(vars, "pkey", nvhttp.pkey);
     path_f(vars, "cert", nvhttp.cert);