deps: update vendor dependencies for S3-compatible storage

Updates AWS SDK and removes Blazer B2 dependency in favor of unified
S3-compatible approach. Includes configuration examples and documentation.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

vendor/github.com/kurin/blazer/base/strings.go

@@ -0,0 +1,28 @@
+// Copyright 2017, the Blazer authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package base
+
+import (
+	"net/url"
+	"strings"
+)
+
+func escape(s string) string {
+	return strings.Replace(url.QueryEscape(s), "%2F", "/", -1)
+}
+
+func unescape(s string) (string, error) {
+	return url.QueryUnescape(s)
+}