Initial commit — DRB server stack

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

drb-server-discord-bot/app/config.py

@@ -0,0 +1,14 @@
+from pydantic_settings import BaseSettings
+from typing import Optional
+
+
+class Settings(BaseSettings):
+    discord_token: str
+    c2_url: str = "http://localhost:8000"
+    dev_guild_id: Optional[int] = None  # set to sync commands instantly during dev
+
+    class Config:
+        env_file = ".env"
+
+
+settings = Settings()