fix(deps): switch reqwest to rustls-tls for cross-compilation

Eliminates the openssl-sys dependency that prevented linux-arm64
cross-compilation with the cross tool. rustls works without any
native OpenSSL headers on the target platform.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: easel

Cargo.toml

@@ -98,7 +98,7 @@ tonic = { version = "0.13", features = ["transport"] }
 tonic-build = "0.13"
 prost = "0.13"
 axum = "0.8"
-reqwest = { version = "0.12", features = ["stream"] }
+reqwest = { version = "0.12", features = ["stream", "json", "rustls-tls"], default-features = false }
 
 # GraphQL
 async-graphql = "7"

crates/axon-cli/Cargo.toml

@@ -30,7 +30,7 @@ tracing.workspace = true
 tracing-subscriber.workspace = true
 clap.workspace = true
 tokio = { workspace = true, optional = true }
-reqwest = { version = "0.12", features = ["blocking"], optional = true }
+reqwest = { version = "0.12", features = ["blocking", "rustls-tls"], default-features = false, optional = true }
 
 [features]
 default = ["serve"]