feat: log the resolved whisper device on bridge load

The bridge only logged Whisper's device on the CPU-fallback path, so a
successful GPU (or silent CPU) load was invisible. Print the CTranslate2-
resolved device on success and on the fallback load, so it is verifiable that
STT is actually running on cuda alongside ollama (GPU) and MeloTTS (cuda).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

bridge/server.py

@@ -150,12 +150,17 @@ def _ensure_brain():
             compute = os.environ.get("WHISPER_COMPUTE_TYPE", "auto")
             try:
                 whisper = WhisperModel(cfg.whisper_model, device=device, compute_type=compute)
+                # Log the device actually resolved by CTranslate2 (device="auto"
+                # picks cuda when available) so a silent CPU load is visible.
+                resolved = str(getattr(getattr(whisper, "model", None), "device", device)).lower()
+                print(f"[bridge] whisper loaded on {resolved} (compute={compute})", flush=True)
             except Exception as ge:
                 # GPU not available / unsupported -> fall back to CPU so the
                 # bridge still works without a GPU passed to the container.
                 if device != "cpu":
                     print(f"[bridge] whisper device='{device}' failed ({ge}); falling back to CPU", flush=True)
                     whisper = WhisperModel(cfg.whisper_model, device="cpu", compute_type="int8")
+                    print("[bridge] whisper loaded on cpu (compute=int8)", flush=True)
                 else:
                     raise