Initial commit: Nexus Mission Control Platform

- ASP.NET Core 10 Backend (JWT Auth, Agent config API)
- Vue 3 Frontend (Dashboard, Team, Agents, Config Editor)
- PostgreSQL Database
- Docker Compose setup
- Mission Control Dashboard redesign

.gitignore

@@ -0,0 +1,31 @@
+# Nexus .gitignore
+
+# Build outputs
+backend/bin/
+backend/obj/
+frontend/dist/
+frontend/node_modules/
+
+# Environment
+.env
+!.env.example
+
+# IDE
+.idea/
+.vs/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Docker
+docker-compose.override.yml
+
+# Logs
+*.log
+
+# OS temp
+*.tmp