feat: Initialize NxMesh project with Docker, Nginx, PostgreSQL, and Rust backend

- Add Docker Compose configuration for development environment
- Create Nginx configuration files for routing and health checks
- Set up PostgreSQL database with health checks
- Add .dockerignore and .gitignore files to exclude unnecessary files
- Initialize Cargo.toml and Cargo.lock for Rust dependencies
- Include GNU General Public License for project
- Add README.md for project description
- Create Justfile for development workflow commands

.devcontainer/nginx/conf.d/default.conf

@@ -0,0 +1,20 @@
+# Default nginx configuration
+# The agent can dynamically modify this to route traffic as needed
+
+server {
+    listen 80;
+    server_name localhost;
+
+    # Default health check
+    location /health {
+        access_log off;
+        return 200 "nginx ok\n";
+        add_header Content-Type text/plain;
+    }
+
+    # Default stub - agent configures actual routing
+    location / {
+        return 200 "NxMesh Data Plane\n";
+        add_header Content-Type text/plain;
+    }
+}