Phase 2.1: Backend project initialized with Docker configuration

- Created Cargo.toml with all required dependencies
- Implemented health/ready endpoints
- Added Docker configuration (production + development)
- Configured docker-compose with resource limits
- Set up MongoDB service with persistence
- Verified build (cargo check passed)
- Prepared monorepo structure for mobile/web/shared

Next: Phase 2.2 (MongoDB connection and models)

backend/docker/Dockerfile.dev

@@ -0,0 +1,10 @@
+FROM rust:1.75-alpine
+WORKDIR /app
+RUN apk add --no-cache musl-dev pkgconf openssl-dev curl wget git pkgconfig
+RUN cargo install cargo-watch
+COPY Cargo.toml Cargo.lock ./
+RUN mkdir src && echo 'fn main() {}' > src/main.rs
+RUN cargo build && rm -rf src
+COPY src ./src
+EXPOSE 8000
+CMD ['cargo-watch', '-x', 'run']