feat: store packaged user data under data directory

app/diagnostics.py

@@ -10,7 +10,7 @@ import traceback
 
 from . import appconfig
 
-DEFAULT_LOG_DIR = "logs"
+DEFAULT_LOG_DIR = appconfig.diagnostic_log_dir()
 DEFAULT_LOG_FILE = "cmshopee.log"
 DEFAULT_MAX_BYTES = 2 * 1024 * 1024
 DEFAULT_BACKUPS = 3
@@ -115,4 +115,4 @@ def _rotate_if_needed(path, max_bytes=DEFAULT_MAX_BYTES, backups=DEFAULT_BACKUPS
         target = f"{path}.{index + 1}"
         if os.path.exists(source):
             os.replace(source, target)
-    os.replace(path, f"{path}.1")
+    os.replace(path, f"{path}.1")