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>

.claude/settings.local.json

@@ -0,0 +1,7 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(git reset:*)"
+    ]
+  }
+}