libfeedback: Make libfeedback.h only include other files

Move the init functions to their own header so we don't clutter
libfeedback.h more in the future.

Signed-off-by: Guido Günther <agx@sigxcpu.org>

libfeedback/libfeedback.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2020 Purism SPC
+ *               2025 The Phosh Developers
  *
  * SPDX-License-Identifier: LGPL-2.1+
  */
@@ -18,14 +19,6 @@ G_BEGIN_DECLS
 #include "lfb-enums.h"
 #include "lfb-event.h"
 #include "lfb-gdbus.h"
-
-gboolean    lfb_init (const gchar *app_id, GError **error);
-void        lfb_uninit (void);
-void        lfb_set_app_id (const char *app_id);
-const char *lfb_get_app_id (void);
-gboolean    lfb_is_initted (void);
-void        lfb_set_feedback_profile (const char *profile);
-const char *lfb_get_feedback_profile (void);
-LfbGdbusFeedback *lfb_get_proxy (void);
+#include "lfb-main.h"
 
 G_END_DECLS