OpenDAL S3 parameter support (#6127)

* deps: upgrade the reqwest stack to 0.13

The reqwest 0.13 rustls feature selects the aws-lc provider. Use
rustls-no-provider instead, add rustls 0.23 with the ring provider, and
install that provider at process startup. This keeps Vaultwarden on the
existing ring crypto provider while giving reqwest, OpenDAL and lettre a
process-wide rustls provider.

Disable openidconnect default features and provide a small
AsyncHttpClient wrapper around Vaultwarden's shared reqwest client
builder. This preserves custom DNS, request blocking, timeouts and the
no-redirect OIDC behavior without openidconnect enabling its own reqwest
stack.

Upgrade yubico_ng to 0.15.0 and OpenDAL to 0.56.0. OpenDAL 0.56 also
moves S3 signing to reqsign 3, so switch the optional S3 dependencies
from reqsign/anyhow to reqsign-core and reqsign-aws-v4 and adapt the AWS
SDK credential bridge to the new ProvideCredential API.

Adjust the local OpenDAL call sites for the 0.56 API: use the FS_SCHEME
constant for filesystem checks and replace deprecated remove_all() with
delete_with(...).recursive(true) for Send file cleanup.

* storage: add OpenDAL S3 URI options

OpenDAL S3 storage accepts bucket and root path data today, but
serverless deployments also need URI query parameters to describe provider
behavior in one DATA_FOLDER value.

Update OpenDAL to 0.56.0 and build S3 operators with
S3Config::from_uri(). Keep Vaultwarden's AWS SDK credential chain by
installing a reqsign provider when the URI does not explicitly request
OpenDAL-native credential handling.

Move path handling and operator construction into storage.rs so S3-specific
parsing, credential setup, and URI path manipulation stay out of
configuration handling. Local filesystem behavior is unchanged, and S3
child paths are derived before query strings.

src/api/core/sends.rs

@@ -568,7 +568,7 @@ async fn post_access_file(
 async fn download_url(host: &Host, send_id: &SendId, file_id: &SendFileId) -> Result<String, crate::Error> {
     let operator = CONFIG.opendal_operator_for_path_type(&PathType::Sends)?;
 
-    if operator.info().scheme() == <&'static str>::from(opendal::Scheme::Fs) {
+    if crate::storage::is_fs_operator(&operator) {
         let token_claims = crate::auth::generate_send_claims(send_id, file_id);
         let token = crate::auth::encode_jwt(&token_claims);