feat: Sprechgeschwindigkeit-Range auf 0.1-5.0 erweitert

TTS_SPEED_MIN 0.5 → 0.1, TTS_SPEED_MAX 2.0 → 5.0.
Bridge-seitige Validierungen (aria_bridge.py + f5tts/bridge.py) mit-
gezogen auf den gleichen Bereich.

Hinweis: Extremwerte (unter 0.5 oder ueber 2.0) koennen bei F5-TTS
verzerrte Ausgaben produzieren — Stefan bekommt die Freiheit zum
Experimentieren.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

bridge/aria_bridge.py

@@ -1176,7 +1176,7 @@ class ARIABridge:
             # Speed-Override (TTS-Wiedergabegeschwindigkeit, pro Geraet)
             try:
                 speed = float(payload.get("speed", 0) or 0)
-                if 0.25 <= speed <= 4.0:
+                if 0.1 <= speed <= 5.0:
                     self._next_speed_override = speed
             except (TypeError, ValueError):
                 pass
@@ -1236,7 +1236,7 @@ class ARIABridge:
             xtts_voice = payload.get("voice", "") or getattr(self, 'xtts_voice', '')
             try:
                 xtts_speed = float(payload.get("speed", 0) or 0)
-                if not (0.25 <= xtts_speed <= 4.0):
+                if not (0.1 <= xtts_speed <= 5.0):
                     xtts_speed = 1.0
             except (TypeError, ValueError):
                 xtts_speed = 1.0
@@ -1450,7 +1450,7 @@ class ARIABridge:
                 logger.info("[rvs] Voice-Override (via Audio): %s", voice_override)
             try:
                 speed = float(payload.get("speed", 0) or 0)
-                if 0.25 <= speed <= 4.0:
+                if 0.1 <= speed <= 5.0:
                     self._next_speed_override = speed
             except (TypeError, ValueError):
                 pass