docs: Add compilation fixes documentation

backend/COMPILATION-FIXES.md

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+# 🔧 Compilation Errors Fixed
+
+## Status: ✅ Fixed & Pushed
+
+**Date**: 2026-02-15 19:02:00 UTC
+
+---
+
+## Issues Found
+
+### 1. PasswordService::new() Not Found
+```rust
+error[E0599]: no function or associated item named `new` found for struct `PasswordService`
+```
+
+**Cause**: PasswordService is a struct with only static methods, no constructor.
+
+**Fix**: Use static methods directly:
+```rust
+// Before (wrong)
+let password_service = PasswordService::new();
+let hash = password_service.hash_password(password);
+
+// After (correct)
+let hash = PasswordService::hash_password(password);
+```
+
+### 2. Handler Trait Not Implemented
+```rust
+error[E0277]: the trait bound `fn(...) -> ... {setup_recovery}: Handler<_, _>` is not satisfied
+```
+
+**Cause**: Axum handler signature mismatch.
+
+**Fix**: Updated to use proper extractors and imports.
+
+---
+
+## Files Modified
+
+### 1. `backend/src/models/user.rs`
+- Removed `PasswordService::new()` calls
+- Use `PasswordService::hash_password()` directly
+- Import `verify_password` function
+
+### 2. `backend/src/handlers/auth.rs`
+- Import `verify_password` from `crate::auth::password`
+- Use `verify_password()` instead of `user.verify_password()`
+- Updated all password verification calls
+
+### 3. `backend/src/auth/jwt.rs`
+- No changes needed (already correct)
+
+---
+
+## Next Steps
+
+1. Pull changes on server: `git pull`
+2. Restart container: `docker compose restart backend`
+3. Check compilation: `docker logs normogen-backend-dev`
+4. Run test script: `./test-password-recovery.sh`
+
+---
+
+**Status**: Ready for testing