Freie Hand (A3): Medien-/Lautstärke-Steuerung für den PC

- executor.py: /media (play_pause/next/prev/stop) + /volume (up/down/mute,
  steps 1-25) via pyautogui Media-Keys — wirkt wie Multimedia-Tastatur
- mcp_pc.py: Tools pc_media + pc_volume für Hermes

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

client/hermes-pc/executor.py

@@ -108,6 +108,42 @@ async def press_keys(req: dict):
         raise HTTPException(500, str(e))
 
 
+# ── Medien & Lautstärke (A3: Lucy steuert den PC per Sprache) ──────────────
+# Media-Keys wirken auf den AKTIVEN Player (Spotify, YouTube, VLC …) — genau wie
+# die Tasten auf einer Multimedia-Tastatur. Lautstärke = System-Master (2 % je Schritt).
+MEDIA_KEYS = {"play_pause": "playpause", "next": "nexttrack", "prev": "prevtrack", "stop": "stop"}
+VOLUME_KEYS = {"up": "volumeup", "down": "volumedown", "mute": "volumemute"}
+
+
+@app.post("/media", dependencies=[Depends(require_auth)])
+async def media_control(req: dict):
+    action = (req.get("action") or "").strip().lower()
+    key = MEDIA_KEYS.get(action)
+    if not key:
+        raise HTTPException(400, f"Unbekannte Aktion '{action}'. Erlaubt: {', '.join(MEDIA_KEYS)}")
+    try:
+        import pyautogui
+        pyautogui.press(key)
+        return {"ok": True, "action": action}
+    except Exception as e:
+        raise HTTPException(500, str(e))
+
+
+@app.post("/volume", dependencies=[Depends(require_auth)])
+async def volume_control(req: dict):
+    action = (req.get("action") or "").strip().lower()
+    key = VOLUME_KEYS.get(action)
+    if not key:
+        raise HTTPException(400, f"Unbekannte Aktion '{action}'. Erlaubt: {', '.join(VOLUME_KEYS)}")
+    steps = 1 if action == "mute" else max(1, min(25, int(req.get("steps", 5))))
+    try:
+        import pyautogui
+        pyautogui.press(key, presses=steps, interval=0.02)
+        return {"ok": True, "action": action, "steps": steps}
+    except Exception as e:
+        raise HTTPException(500, str(e))
+
+
 # ── Apps / Browser ─────────────────────────────────────────────────────────
 
 @app.post("/open", dependencies=[Depends(require_auth)])