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/vfile-location/index.d.ts

@@ -0,0 +1,47 @@
+import type {Point as UnistPoint} from 'unist'
+
+export {location} from './lib/index.js'
+
+/**
+ * Accessors for index.
+ */
+export interface Location {
+  /**
+   * Get the `offset` from a line/column based `Point` in the bound indices;
+   * returns `undefined` when given out of bounds input.
+   *
+   * @param point
+   *   Line/column based `Point`.
+   * @returns
+   *   Offset.
+   */
+  toOffset(point?: PointLike | null | undefined): number | undefined
+  /**
+   * Get the line/column based `Point` for `offset` in the bound indices;
+   * returns `undefined` when given out of bounds input.
+   *
+   * @param offset
+   *   Offset.
+   * @returns
+   *   `Point`.
+   */
+  toPoint(offset?: number | null | undefined): UnistPoint | undefined
+}
+
+/**
+ * Point from `unist`, allowed as input.
+ */
+interface PointLike {
+  /**
+   * Column.
+   */
+  column?: number | null | undefined
+  /**
+   * Line.
+   */
+  line?: number | null | undefined
+  /**
+   * Offset.
+   */
+  offset?: number | null | undefined
+}