Initial commit

Add Discord Archive Manager project with:
- Entity Framework Core data models for Discord exports
- JSON import service for processing Discord chat exports
- Archive service for managing imported data
- Docker configuration for containerized deployment

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

docker-compose.yml

@@ -0,0 +1,11 @@
+services:
+  discord-archive:
+    build: .
+    volumes:
+      - ./input:/app/input
+      - ./archive:/app/archive
+      - ./images:/app/images
+    env_file:
+      - .env
+    extra_hosts:
+      - "host.docker.internal:host-gateway"