Initial commit — DRB server stack

Includes c2-core (FastAPI/MQTT/Firestore), discord-bot (slash commands),
frontend (Next.js admin UI), and mosquitto config.

drb-c2-core/app/internal/storage.py

@@ -0,0 +1,28 @@
+import asyncio
+from typing import Optional
+from app.config import settings
+from app.internal.logger import logger
+
+
+async def upload_audio(data: bytes, filename: str) -> Optional[str]:
+    """Upload audio bytes to GCS and return the public URL, or None if disabled."""
+    if not settings.gcs_bucket:
+        logger.info("GCS_BUCKET not configured — skipping audio upload.")
+        return None
+
+    def _upload() -> str:
+        from google.cloud import storage
+        client = storage.Client()
+        bucket = client.bucket(settings.gcs_bucket)
+        blob = bucket.blob(f"calls/{filename}")
+        blob.upload_from_string(data, content_type="audio/mpeg")
+        blob.make_public()
+        return blob.public_url
+
+    try:
+        url = await asyncio.to_thread(_upload)
+        logger.info(f"Audio uploaded: {url}")
+        return url
+    except Exception as e:
+        logger.error(f"GCS upload failed: {e}")
+        return None