Handle missing planner YAML files and add src universe config

Author: ShunRao010

src/configs/universe.yaml

@@ -0,0 +1,10 @@
+universe:
+  exchanges: ["okx"]
+  # Use canonical_symbol or exchange_symbol based on planner logic.
+  symbols:
+    okx:
+      - "BTC-USDT-SWAP"
+      - "ETH-USDT-SWAP"
+  # candles timeframes
+  timeframes: ["1m", "5m"]
+  endpoints: ["candles", "funding", "open_interest"]

src/orchestrator/planner.py

@@ -31,6 +31,8 @@ class UniverseRow:
 
 
 def _load_yaml(path: Path) -> dict:
+    if not path.exists():
+        return {}
     with path.open("r", encoding="utf-8") as f:
         return yaml.safe_load(f) or {}