Fix global_args not propagated to state module

text.py's set_global_args() was only setting its local global_args but
not calling state.set_global_args(). This meant _load_default_model()
and _load_model_by_name() got None from get_global_args(), so CLI flags
like --flash-attn, --n-gpu-layers, --ram were not passed to backends.

codai/api/text.py

@@ -41,6 +41,8 @@ def set_global_args(args):
     """Set global args from coderai."""
     global global_args
     global_args = args
+    # Also set in the state module so other modules can access it
+    _set_global_args(args)
 
 
 def set_global_debug(debug: bool):