fix(docker): Add missing client-wasm directory and update Rust version

- Add COPY client-wasm to Dockerfile to include workspace member
- Update Rust base image from 1.91 to 1.92
- Fixes CI build failure: "failed to load manifest for workspace member client-wasm"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Dockerfile

@@ -1,6 +1,6 @@
 # Multi-stage build for Barycenter OpenID Connect IdP
 # Build stage
-FROM rust:1.91-bookworm AS builder
+FROM rust:1.92-bookworm AS builder
 
 WORKDIR /build
 
@@ -10,6 +10,7 @@ COPY Cargo.toml Cargo.lock ./
 # Copy source code
 COPY src ./src
 COPY migration ./migration
+COPY client-wasm ./client-wasm
 
 # Build release binary with platform-specific caches to avoid race conditions
 ARG TARGETPLATFORM