chore(release): bump version to 0.8.0

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -4027,7 +4027,7 @@ dependencies = [
 
 [[package]]
 name = "oxicloud"
-version = "0.7.0"
+version = "0.8.0"
 dependencies = [
  "accept-language",
  "aes-gcm",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "oxicloud"
-version = "0.7.0"
+version = "0.8.0"
 edition = "2024"
 default-run = "oxicloud"