fix: Define LOGS_DIR before use to resolve NameError

Add path constants (BASE_DIR, DATA_DIR, LOGS_DIR) immediately after
imports and before logging configuration. LOGS_DIR was being used
without definition, causing runtime crash on line 29.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.py

@@ -24,6 +24,12 @@ from dataclasses import dataclass, asdict
 from enum import Enum
 import logging
 
+# ========== Path Constants ==========
+BASE_DIR = Path(__file__).resolve().parent
+DATA_DIR = BASE_DIR / ".openclaw" / "logs"
+LOGS_DIR = DATA_DIR
+LOGS_DIR.mkdir(parents=True, exist_ok=True)
+
 # ========== Logging Configuration ==========
 # Configure logging early to capture all events
 LOGS_DIR.mkdir(parents=True, exist_ok=True)