fix: correct docker environment variable name and remove unnecessary runtime deps

backend/docker-compose.dev.yml

@@ -17,7 +17,7 @@ services:
       - SERVER_PORT=8000
       - SERVER_HOST=0.0.0.0
       - MONGODB_URI=mongodb://mongodb:27017
-      - MONGODB_DATABASE=normogen_dev
+      - DATABASE_NAME=normogen_dev
       - JWT_SECRET=dev-jwt-secret-key-minimum-32-chars
       - RUST_LOG_STYLE=always
     depends_on:

backend/docker/Dockerfile.dev

@@ -30,12 +30,6 @@ FROM rust:1.93-slim
 
 WORKDIR /app
 
-# Install runtime dependencies
-RUN apt-get update && apt-get install -y \
-    pkg-config \
-    libssl-dev \
-    && rm -rf /var/lib/apt/lists/*
-
 # Copy the binary from builder
 COPY --from=builder /app/target/debug/normogen-backend /app/normogen-backend