feat(openapi): complete upload preview and UI evidence

Cargo.toml

@@ -30,7 +30,7 @@ publish = false
 [workspace.dependencies]
 aes-gcm = "0.10"
 argon2 = "0.5"
-axum = "0.8"
+axum = { version = "0.8", features = ["multipart"] }
 axum-extra = { version = "0.12", features = ["cookie"] }
 base64 = "0.22"
 hkdf = "0.12"
@@ -43,7 +43,7 @@ opentelemetry_sdk = { version = "0.32.1", default-features = false, features = [
 percent-encoding = "2"
 prost = "0.14"
 rand = "0.10"
-reqwest = { version = "0.12", default-features = false, features = ["cookies", "json", "rustls-tls"] }
+reqwest = { version = "0.12", default-features = false, features = ["cookies", "json", "multipart", "rustls-tls"] }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 serde_yaml = "0.9"