refactor: rebrand from Secure Portal to SafeDocs Portal

Update all container names and image references:
- secure-portal-* → safedocs-portal-*
- Docker images now use safedocs-portal-backend/frontend
- MAIL_FROM_NAME default updated to "SafeDocs Portal"

This aligns with the complete rebranding of the product.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,4 +1,4 @@
-# Secure Portal - Production Docker Compose
+# SafeDocs Portal - Production Docker Compose
 # Pull with: docker compose pull
 # Start with: docker compose up -d
 
@@ -6,7 +6,7 @@ services:
     # PostgreSQL Database
     postgres:
         image: postgres:16-alpine
-        container_name: secure-portal-db
+        container_name: safedocs-portal-db
         restart: unless-stopped
         environment:
             POSTGRES_USER: ${POSTGRES_USER}
@@ -23,7 +23,7 @@ services:
     # Redis Cache
     redis:
         image: redis:7-alpine
-        container_name: secure-portal-redis
+        container_name: safedocs-portal-redis
         restart: unless-stopped
         command: redis-server --appendonly yes --requirepass ${REDIS_PASSWORD}
         volumes:
@@ -36,8 +36,8 @@ services:
 
     # Backend API
     backend:
-        image: git.unixweb.net/unixweb/secure-portal-backend:latest
-        container_name: secure-portal-backend
+        image: git.unixweb.net/unixweb/safedocs-portal-backend:latest
+        container_name: safedocs-portal-backend
         restart: unless-stopped
         ports:
             - "3000:3000"
@@ -54,7 +54,7 @@ services:
             PASSWORD_RESET_URL: ${PASSWORD_RESET_URL}
             MAIL_PROVIDER: ${MAIL_PROVIDER:-brevo}
             MAIL_FROM_EMAIL: ${MAIL_FROM_EMAIL}
-            MAIL_FROM_NAME: ${MAIL_FROM_NAME:-Secure Portal}
+            MAIL_FROM_NAME: ${MAIL_FROM_NAME:-SafeDocs Portal}
             BREVO_API_KEY: ${BREVO_API_KEY}
             ENCRYPTION_KEY: ${ENCRYPTION_KEY}
             CORS_ORIGIN: ${CORS_ORIGIN}
@@ -83,8 +83,8 @@ services:
 
     # Frontend (Nginx)
     frontend:
-        image: git.unixweb.net/unixweb/secure-portal-frontend:latest
-        container_name: secure-portal-frontend
+        image: git.unixweb.net/unixweb/safedocs-portal-frontend:latest
+        container_name: safedocs-portal-frontend
         restart: unless-stopped
         ports:
             - "80:80"
@@ -96,7 +96,7 @@ services:
     # ClamAV Virus Scanner
     clamav:
         image: clamav/clamav:latest
-        container_name: secure-portal-clamav
+        container_name: safedocs-portal-clamav
         restart: unless-stopped
         volumes:
             - clamav_data:/var/lib/clamav