Fix all compiler warnings across server and client

- Remove unused ServerConfig struct (config via CLI args)
- Remove unused otpks field from Database (not yet needed)
- Wire AppError into message routes with proper error propagation
- Remove unused imports in send.rs (Seed, MessageContent, etc.)
- Suppress dead_code on BundleResponse.fingerprint (needed by serde)

Zero warnings, 17/17 tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/crates/warzone-client/src/cli/send.rs

@@ -1,8 +1,6 @@
 use anyhow::{Context, Result};
-use warzone_protocol::identity::Seed;
-use warzone_protocol::message::{MessageContent, MessageType, WarzoneMessage};
 use warzone_protocol::ratchet::{RatchetMessage, RatchetState};
-use warzone_protocol::types::{Fingerprint, MessageId, SessionId};
+use warzone_protocol::types::Fingerprint;
 use warzone_protocol::x3dh;
 use x25519_dalek::PublicKey;
 

warzone/crates/warzone-client/src/net.rs

@@ -23,6 +23,7 @@ struct SendRequest {
 }
 
 #[derive(Deserialize)]
+#[allow(dead_code)]
 struct BundleResponse {
     fingerprint: String,
     bundle: String, // base64