Feat: Hermes Voice Client — CustomTkinter GUI + Push-to-Talk + .exe Build

- main.py: CustomTkinter GUI (400x520) mit Status-Indikator, Conversation-Log,
  Screenshot-Toggle und Settings-Dialog. Thread-sicherer UI-Queue für Hotkey-Callbacks.
- hotkey_listener.py: pynput globaler Hotkey (press/release) + KeyCapturer für
  interaktive Hotkey-Konfiguration im Settings-Dialog.
- config_manager.py: JSON-Settings in ~/.hermes-voice/settings.json mit DEFAULTS,
  load() merged gespeicherte mit Default-Werten.
- audio_input.py: Vereinfacht auf start_recording/stop_recording/transcribe (kein
  Wake-Word-Loop mehr, direkt hotkey-gesteuert).
- ai_client.py: Settings-dict statt config.py-Imports, MC2-URL/Modelle konfigurierbar.
- requirements.txt: customtkinter>=5.2.0 + pynput>=1.7.6 hinzugefügt, pystray entfernt.
- build.bat: PyInstaller --onefile --windowed → dist/HermesVoice.exe.
- setup.bat: Veraltete Wake-Word-Hinweise entfernt, GUI-Check angepasst.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/hermes-voice/config_manager.py

@@ -0,0 +1,39 @@
+import json
+from pathlib import Path
+
+CONFIG_DIR = Path.home() / ".hermes-voice"
+SETTINGS_FILE = CONFIG_DIR / "settings.json"
+
+DEFAULTS = {
+    "mc2_url": "http://192.168.178.151:9001/v1",
+    "chat_model": "Hermes-4-14B",
+    "vision_model": "Qwen3-VL-2B-Instruct",
+    "hotkey": "ctrl_r",
+    "tts_voice": "de-DE-KillianNeural",
+    "tts_rate": "+0%",
+    "whisper_model": "small",
+    "language": "de",
+    "screenshot_enabled": True,
+    "screenshot_monitor": 1,
+    "max_response_tokens": 200,
+    "silence_timeout": 1.5,
+}
+
+
+def load() -> dict:
+    CONFIG_DIR.mkdir(exist_ok=True)
+    if SETTINGS_FILE.exists():
+        try:
+            saved = json.loads(SETTINGS_FILE.read_text(encoding="utf-8"))
+            return {**DEFAULTS, **saved}
+        except Exception:
+            pass
+    return dict(DEFAULTS)
+
+
+def save(settings: dict):
+    CONFIG_DIR.mkdir(exist_ok=True)
+    SETTINGS_FILE.write_text(
+        json.dumps(settings, indent=2, ensure_ascii=False),
+        encoding="utf-8",
+    )