ttstoy: decouple from built-in Audio cog

Use the shared Red-Lavalink client directly instead of depending on
redbot.cogs.audio: import lavalink; connect via lavalink.connect();
gate WebUI playback on lavalink.get_all_nodes() instead of
get_cog('Audio'). Playback (get_player pause/save/restore) unchanged.
The lavalink client is now owned by the YTAudio cog.

ttstoy/ttstoy.py

@@ -24,7 +24,7 @@ import requests
 from redbot.core import commands, Config
 from redbot.core.bot import Red, cog_data_path
 from redbot.core.commands import Cog
-from redbot.cogs.audio import Audio
+import lavalink
 
 try:
     from .morshutalk_engine import Morshu
@@ -2433,10 +2433,13 @@ class TtsToy(Cog):
         async with ctx.typing():
             # Check if user is in a VC - we'll play there if so, but it's not required
             user_in_vc = ctx.author.voice and ctx.author.voice.channel
-            audio: Optional[Audio] = self.bot.get_cog("Audio")
 
-            if user_in_vc and audio and not ctx.guild.me.voice:
-                await ctx.invoke(audio.command_summon)
+            if user_in_vc and not ctx.guild.me.voice:
+                # Connect via the shared Lavalink client (owned by the YTAudio cog).
+                try:
+                    await lavalink.connect(ctx.author.voice.channel)
+                except Exception:
+                    log.exception("[TTS] Failed to connect to voice channel via Lavalink.")
 
             mode = await self._get_tts_mode()
 
@@ -2903,9 +2906,8 @@ class TtsToy(Cog):
                 return
 
             member = member_guild.get_member(user_id)
-            audio_cog: Optional[Audio] = self.bot.get_cog("Audio")
-            if not audio_cog:
-                log.warning("[WebUI] Audio cog not loaded - skipping VC playback")
+            if not lavalink.get_all_nodes():
+                log.warning("[WebUI] Lavalink not connected - skipping VC playback")
                 return
             text_channel = member_guild.system_channel or next(
                 (c for c in member_guild.text_channels
@@ -2915,7 +2917,7 @@ class TtsToy(Cog):
                 log.warning("[WebUI] No text channel available for VC playback")
                 return
             if not member_guild.me.voice or member_guild.me.voice.channel != member_vc:
-                await member_vc.connect()
+                await lavalink.connect(member_vc)
 
             class _FakeCtx:
                 guild = member_guild