Remove misleading Silero OpenAI voice aliases

- Removed arbitrary OpenAI voice mappings from tts-1-silero (alloy→en_0, etc.)
- Kept intentional OpenAI-themed voices in tts-1-kokoro (af_alloy, am_echo, etc.)
- Silero's en_0-en_5 were random selections, not designed to match OpenAI voices
- Kokoro's af_alloy, am_echo, etc. are intentionally OpenAI-compatible by design
- Users can still access all voices by their native names
- Dropdown UI shows model name to differentiate duplicate voice names

🦝 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

voice_to_speaker.default.yaml

@@ -207,32 +207,9 @@ tts-1-hd:
     top_p: 0.85
     comment: You can add a comment here also, which will be persistent and otherwise ignored.
 tts-1-silero:
-  # OpenAI-compatible voice aliases (for compatibility)
-  alloy:
-    language: en
-    speaker: en_0
-    silero_speaker: v3_en
-  echo:
-    language: en
-    speaker: en_1
-    silero_speaker: v3_en
-  fable:
-    language: en
-    speaker: en_2
-    silero_speaker: v3_en
-  onyx:
-    language: en
-    speaker: en_3
-    silero_speaker: v3_en
-  nova:
-    language: en
-    speaker: en_4
-    silero_speaker: v3_en
-  shimmer:
-    language: en
-    speaker: en_5
-    silero_speaker: v3_en
   # All 118 Silero v3_en voices with proper names
+  # NOTE: Use native Silero voice names (en_0, en_1, etc.) for Silero
+  # OpenAI voice names (alloy, echo, etc.) are reserved for tts-1 and tts-1-hd only
   en_0:
     language: en
     speaker: en_0
@@ -806,7 +783,7 @@ tts-1-silero:
     speaker: random
     silero_speaker: v3_fr
 tts-1-kokoro:
-  # OpenAI-compatible voice aliases (American English)
+  # OpenAI-compatible voice aliases (Kokoro's intentional OpenAI-themed voices)
   alloy:
     lang_code: a
     kokoro_voice: af_alloy