feat(backend): Complete Phase 2.4 - User Management Enhancement

Phase 2.4 is now COMPLETE!

Implemented Features:

1. Password Recovery ✅
   - Zero-knowledge recovery phrases
   - Setup, verify, and reset-password endpoints
   - Token invalidation on password reset

2. Enhanced Profile Management ✅
   - Get, update, and delete profile endpoints
   - Password confirmation for deletion
   - Token revocation on account deletion

3. Email Verification (Stub) ✅
   - Verification status check
   - Send verification email (stub - no email server)
   - Verify email with token
   - Resend verification email (stub)

4. Account Settings Management ✅
   - Get account settings endpoint
   - Update account settings endpoint
   - Change password with current password confirmation
   - Token invalidation on password change

New API Endpoints: 11 total

Files Modified:
- backend/src/models/user.rs (added find_by_verification_token)
- backend/src/handlers/auth.rs (email verification handlers)
- backend/src/handlers/users.rs (account settings handlers)
- backend/src/main.rs (new routes)

Testing:
- backend/test-phase-2-4-complete.sh

Documentation:
- backend/PHASE-2-4-COMPLETE.md

Phase 2.4: 100% COMPLETE ✅

backend/test-phase-2-4-complete.sh

@@ -0,0 +1,136 @@
+#!/bin/bash
+# Phase 2.4 Complete Test Script
+
+BASE_URL="http://10.0.10.30:6500"
+
+echo "🧪 Phase 2.4 Complete Test"
+echo "=========================="
+echo ""
+
+EMAIL="phase24test@example.com"
+USERNAME="phase24test"
+PASSWORD="SecurePassword123!"
+
+# Test 1: Register user
+echo "1. Register user..."
+REGISTER=$(curl -s -w "\nHTTP Status: %{http_code}\n" -X POST $BASE_URL/api/auth/register \
+  -H "Content-Type: application/json" \
+  -d "{
+    \"email\": \"$EMAIL\",
+    \"username\": \"$USERNAME\",
+    \"password\": \"$PASSWORD\",
+    \"recovery_phrase\": \"test-recovery-phrase\"
+  }")
+echo "$REGISTER"
+echo ""
+
+# Test 2: Login
+echo "2. Login..."
+LOGIN_RESPONSE=$(curl -s -X POST $BASE_URL/api/auth/login \
+  -H "Content-Type: application/json" \
+  -d "{
+    \"email\": \"$EMAIL\",
+    \"password\": \"$PASSWORD\"
+  }")
+
+echo "$LOGIN_RESPONSE" | jq .
+
+ACCESS_TOKEN=$(echo "$LOGIN_RESPONSE" | jq -r '.access_token // empty')
+
+if [ -z "$ACCESS_TOKEN" ] || [ "$ACCESS_TOKEN" = "null" ]; then
+    echo "❌ Failed to get access token"
+    exit 1
+fi
+
+echo "✅ Access token obtained"
+echo ""
+
+# Test 3: Get verification status
+echo "3. Get email verification status..."
+STATUS=$(curl -s -w "\nHTTP Status: %{http_code}\n" -X GET $BASE_URL/api/auth/verify/status \
+  -H "Authorization: Bearer $ACCESS_TOKEN")
+echo "$STATUS"
+echo ""
+
+# Test 4: Send verification email
+echo "4. Send verification email (stub)..."
+VERIFY_RESPONSE=$(curl -s -X POST $BASE_URL/api/auth/verify/send \
+  -H "Authorization: Bearer $ACCESS_TOKEN")
+
+echo "$VERIFY_RESPONSE" | jq .
+
+# Extract verification token
+VERIFY_TOKEN=$(echo "$VERIFY_RESPONSE" | jq -r '.verification_token // empty')
+echo ""
+echo "Verification token: $VERIFY_TOKEN"
+echo ""
+
+# Test 5: Verify email
+echo "5. Verify email with token..."
+VERIFY_EMAIL=$(curl -s -w "\nHTTP Status: %{http_code}\n" -X POST $BASE_URL/api/auth/verify/email \
+  -H "Content-Type: application/json" \
+  -d "{
+    \"token\": \"$VERIFY_TOKEN\"
+  }")
+echo "$VERIFY_EMAIL"
+echo ""
+
+# Test 6: Check verification status again
+echo "6. Check verification status (should be verified now)..."
+STATUS_AFTER=$(curl -s -w "\nHTTP Status: %{http_code}\n" -X GET $BASE_URL/api/auth/verify/status \
+  -H "Authorization: Bearer $ACCESS_TOKEN")
+echo "$STATUS_AFTER"
+echo ""
+
+# Test 7: Get account settings
+echo "7. Get account settings..."
+SETTINGS=$(curl -s -w "\nHTTP Status: %{http_code}\n" -X GET $BASE_URL/api/users/me/settings \
+  -H "Authorization: Bearer $ACCESS_TOKEN")
+echo "$SETTINGS"
+echo ""
+
+# Test 8: Update account settings
+echo "8. Update account settings..."
+UPDATE_SETTINGS=$(curl -s -w "\nHTTP Status: %{http_code}\n" -X PUT $BASE_URL/api/users/me/settings \
+  -H "Content-Type: application/json" \
+  -H "Authorization: Bearer $ACCESS_TOKEN" \
+  -d '{
+    "theme": "dark",
+    "language": "es",
+    "timezone": "America/Argentina/Buenos_Aires",
+    "email_notifications": true
+  }')
+echo "$UPDATE_SETTINGS"
+echo ""
+
+# Test 9: Change password
+echo "9. Change password..."
+CHANGE_PASSWORD=$(curl -s -w "\nHTTP Status: %{http_code}\n" -X POST $BASE_URL/api/users/me/change-password \
+  -H "Content-Type: application/json" \
+  -H "Authorization: Bearer $ACCESS_TOKEN" \
+  -d '{
+    "current_password": "SecurePassword123!",
+    "new_password": "NewSecurePassword456!"
+  }')
+echo "$CHANGE_PASSWORD"
+echo ""
+
+# Test 10: Try to use old token (should fail - all tokens revoked after password change)
+echo "10. Try to use old access token (should fail)..."
+OLD_TOKEN_TEST=$(curl -s -w "\nHTTP Status: %{http_code}\n" -X GET $BASE_URL/api/users/me \
+  -H "Authorization: Bearer $ACCESS_TOKEN")
+echo "$OLD_TOKEN_TEST"
+echo ""
+
+# Test 11: Login with new password
+echo "11. Login with new password..."
+NEW_LOGIN=$(curl -s -w "\nHTTP Status: %{http_code}\n" -X POST $BASE_URL/api/auth/login \
+  -H "Content-Type: application/json" \
+  -d '{
+    "email": "phase24test@example.com",
+    "password": "NewSecurePassword456!"
+  }')
+echo "$NEW_LOGIN"
+echo ""
+
+echo "✅ All Phase 2.4 tests complete!"