Refactor golden image handling in backup upload process</message>

<message>Update the _set_golden_from_path function to improve the handling of existing golden image files. Replace the existing unlink logic with a more robust method that safely removes files or broken symlinks using the missing_ok parameter. This change enhances the reliability of the backup upload process by ensuring that stale references are properly cleared before setting a new golden image path.

backup-from-device/gnss-guard/tm-gnss-guard/server/docker-compose.dev.yml

@@ -0,0 +1,34 @@
+# GNSS Guard Server - Development Docker Compose
+# No nginx, no SSL - direct access to FastAPI on port 8000
+#
+# Usage:
+#   cp env.example .env.dev
+#   # Edit .env.dev (can use SQLite for dev: sqlite:///./data/gnss_guard.db)
+#   docker compose -f docker-compose.dev.yml up -d
+
+version: '3.8'
+
+services:
+  gnss-server:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: gnss-guard-server-dev
+    restart: unless-stopped
+    env_file:
+      - .env.dev
+    ports:
+      - "8000:8000"
+    volumes:
+      # Mount source code for live reload (development only)
+      - .:/app
+    environment:
+      - GNSS_SERVER_DEBUG=true
+    command: uvicorn main:app --host 0.0.0.0 --port 8000 --reload
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/auth/check"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+