fix(docker): Update to Rust 1.93 to support Edition 2024

backend/docker/Dockerfile.dev

@@ -1,9 +1,29 @@
-FROM rust:latest
+# Development Dockerfile
+# Uses Rust 1.93+ to support Edition 2024 dependencies
+FROM rust:1.93-slim
+
 WORKDIR /app
-RUN apk add --no-cache musl-dev pkgconf openssl-dev curl wget git pkgconfig
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y \
+    pkg-config \
+    libssl-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy Cargo files first for better caching
 COPY Cargo.toml ./
+
+# Create dummy main.rs for dependency caching
 RUN mkdir src && echo 'fn main() {}' > src/main.rs
+
+# Build dependencies (this layer will be cached)
 RUN cargo build && rm -rf src
+
+# Copy actual source code
 COPY src ./src
+
+# Expose port
 EXPOSE 8000
+
+# Run the application
 CMD ["cargo", "run"]