refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

node_modules/extend/.eslintrc

@@ -0,0 +1,17 @@
+{
+	"root": true,
+
+	"extends": "@ljharb",
+
+	"rules": {
+		"complexity": [2, 20],
+		"eqeqeq": [2, "allow-null"],
+		"func-name-matching": [1],
+		"max-depth": [1, 4],
+		"max-statements": [2, 26],
+		"no-extra-parens": [1],
+		"no-magic-numbers": [0],
+		"no-restricted-syntax": [2, "BreakStatement", "ContinueStatement", "DebuggerStatement", "LabeledStatement", "WithStatement"],
+		"sort-keys": [0],
+	}
+}