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/astro/dist/vite-plugin-load-fallback/index.js

@@ -0,0 +1,66 @@
+import nodeFs from "node:fs";
+import npath from "node:path";
+import { slash } from "../core/path.js";
+import { cleanUrl } from "../vite-plugin-utils/index.js";
+function loadFallbackPlugin({
+  fs,
+  root
+}) {
+  if (!fs || fs === nodeFs || fs.default === nodeFs) {
+    return false;
+  }
+  const tryLoadModule = async (id) => {
+    try {
+      return await fs.promises.readFile(cleanUrl(id), "utf-8");
+    } catch {
+      try {
+        return await fs.promises.readFile(id, "utf-8");
+      } catch {
+        try {
+          const fullpath = new URL("." + id, root);
+          return await fs.promises.readFile(fullpath, "utf-8");
+        } catch {
+        }
+      }
+    }
+  };
+  return [
+    {
+      name: "astro:load-fallback",
+      enforce: "post",
+      async resolveId(id, parent) {
+        if (parent) {
+          const candidateId = npath.posix.join(npath.posix.dirname(slash(parent)), id);
+          try {
+            const stats = await fs.promises.stat(candidateId);
+            if (!stats.isDirectory()) {
+              return candidateId;
+            }
+          } catch {
+          }
+        }
+      },
+      async load(id) {
+        const code = await tryLoadModule(id);
+        if (code) {
+          return { code };
+        }
+      }
+    },
+    {
+      name: "astro:load-fallback-hmr",
+      enforce: "pre",
+      handleHotUpdate(context) {
+        const read = context.read;
+        context.read = async () => {
+          const source = await tryLoadModule(context.file);
+          if (source) return source;
+          return read.call(context);
+        };
+      }
+    }
+  ];
+}
+export {
+  loadFallbackPlugin as default
+};