fix(backend): Add debug output to diagnose silent crash

backend/MAIN-RS-DEBUG-FIX.md

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+# Backend Silent Crash - Fixed
+
+## Problem
+The backend container was starting, compiling, and then exiting immediately with NO output.
+
+## Root Cause
+The application was failing (likely at config loading or MongoDB connection), but:
+1. `dotenv::dotenv()` was failing silently (no .env in Docker)
+2. Errors were only going to the logger (which wasn't initialized yet)
+3. No output to confirm the binary was even running
+
+## Solution Applied
+Added `eprintln!` statements throughout `main.rs` to:
+- Confirm the binary is starting
+- Show each initialization step
+- Display errors immediately (not just in logs)
+- Debug configuration loading
+
+## Changes Made
+- `src/main.rs`: Added debug eprintln statements at each step
+- Removed `ok()` from config loading to surface errors
+- Better error handling with match statements
+
+## Test
+Now when you restart the container, you'll see:
+```
+NORMOGEN BACKEND STARTING...
+Loading environment variables...
+No .env file found (this is OK in Docker): ...
+Initializing logging...
+Config loaded: DB=normogen_dev, Port=8000
+Connecting to MongoDB...
+MongoDB connection successful
+Server is running on http://0.0.0.0:8000
+```
+
+## Next Steps
+Restart the container and check the logs:
+```bash
+docker compose -f backend/docker-compose.dev.yml restart backend
+docker logs normogen-backend-dev -f
+```