feat: add MiniMax-M2.7-highspeed model and MiniMax TTS support

- Add MiniMax-M2.7-highspeed constant to const.py and MODEL_LIST
- Update MinimaxBot default model from MiniMax-M2.1 to MiniMax-M2.7
- Add MinimaxVoice TTS provider (voice/minimax/minimax_voice.py)
  - Supports speech-2.8-hd and speech-2.8-turbo models
  - SSE streaming with hex-decoded audio chunks
  - Reuses MINIMAX_API_KEY
- Register MinimaxVoice in voice factory
- Add unit tests (14 tests, all passing)
- Update README with MiniMax-M2.7-highspeed and TTS configuration

voice/minimax/minimax_voice.py

@@ -0,0 +1,106 @@
+# encoding:utf-8
+"""
+MiniMax TTS voice service
+"""
+import datetime
+import random
+import requests
+
+from bridge.reply import Reply, ReplyType
+from common.log import logger
+from config import conf
+from voice.voice import Voice
+
+
+MINIMAX_TTS_VOICES = [
+    "English_Graceful_Lady",
+    "English_Insightful_Speaker",
+    "English_radiant_girl",
+    "English_Persuasive_Man",
+    "English_Lucky_Robot",
+    "English_expressive_narrator",
+    "Chinese_Warm_Woman",
+    "Chinese_Gentle_Man",
+]
+
+
+class MinimaxVoice(Voice):
+    def __init__(self):
+        self.api_key = conf().get("minimax_api_key")
+        self.api_base = conf().get("minimax_api_base") or "https://api.minimax.io"
+        # Strip trailing /v1 if present so we can always append /v1/t2a_v2
+        self.api_base = self.api_base.rstrip("/")
+        if self.api_base.endswith("/v1"):
+            self.api_base = self.api_base[:-3]
+
+    def voiceToText(self, voice_file):
+        """MiniMax does not provide an ASR endpoint; raise NotImplementedError."""
+        raise NotImplementedError("MiniMax voice-to-text is not supported")
+
+    def textToVoice(self, text):
+        try:
+            model = conf().get("text_to_voice_model") or "speech-2.8-hd"
+            voice_id = conf().get("tts_voice_id") or "English_Graceful_Lady"
+
+            url = f"{self.api_base}/v1/t2a_v2"
+            headers = {
+                "Content-Type": "application/json",
+                "Authorization": f"Bearer {self.api_key}",
+            }
+            payload = {
+                "model": model,
+                "text": text,
+                "stream": True,
+                "voice_setting": {
+                    "voice_id": voice_id,
+                    "speed": 1,
+                    "vol": 1,
+                    "pitch": 0,
+                },
+                "audio_setting": {
+                    "sample_rate": 32000,
+                    "bitrate": 128000,
+                    "format": "mp3",
+                    "channel": 1,
+                },
+            }
+
+            response = requests.post(url, headers=headers, json=payload, stream=True, timeout=60)
+            response.raise_for_status()
+
+            # Parse SSE stream and collect hex-encoded audio chunks
+            audio_chunks = []
+            buffer = ""
+            for raw in response.iter_lines():
+                if not raw:
+                    continue
+                line = raw.decode("utf-8") if isinstance(raw, bytes) else raw
+                if not line.startswith("data:"):
+                    continue
+                json_str = line[5:].strip()
+                if not json_str or json_str == "[DONE]":
+                    continue
+                try:
+                    import json
+                    event_data = json.loads(json_str)
+                    audio_hex = event_data.get("data", {}).get("audio")
+                    if audio_hex:
+                        audio_chunks.append(bytes.fromhex(audio_hex))
+                except Exception:
+                    continue
+
+            if not audio_chunks:
+                logger.error("[MINIMAX] TTS returned no audio data")
+                return Reply(ReplyType.ERROR, "语音合成失败，未获取到音频数据")
+
+            audio_data = b"".join(audio_chunks)
+            file_name = "tmp/" + datetime.datetime.now().strftime("%Y%m%d%H%M%S") + str(random.randint(0, 1000)) + ".mp3"
+            with open(file_name, "wb") as f:
+                f.write(audio_data)
+
+            logger.info(f"[MINIMAX] textToVoice success, file={file_name}")
+            return Reply(ReplyType.VOICE, file_name)
+
+        except Exception as e:
+            logger.error(f"[MINIMAX] textToVoice error: {e}")
+            return Reply(ReplyType.ERROR, "遇到了一点小问题，请稍后再试")