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/aws/aws-sdk-go/internal/ini/comma_token.go

@@ -0,0 +1,11 @@
+package ini
+
+var commaRunes = []rune(",")
+
+func isComma(b rune) bool {
+	return b == ','
+}
+
+func newCommaToken() Token {
+	return newToken(TokenComma, commaRunes, NoneType)
+}