app: wire volume and certificate config

src/tuimble/app.py

@@ -361,6 +361,8 @@ class TuimbleApp(App):
             port=srv.port,
             username=srv.username,
             password=srv.password,
+            certfile=srv.certfile,
+            keyfile=srv.keyfile,
         )
         self._history: list[str] = []
         self._history_idx: int = -1
@@ -372,6 +374,8 @@ class TuimbleApp(App):
             input_device=acfg.input_device,
             output_device=acfg.output_device,
         )
+        self._audio.input_gain = acfg.input_gain
+        self._audio.output_gain = acfg.output_gain
 
     def compose(self) -> ComposeResult:
         yield Header()